Cai R. Ytsma, M. Darby Dyar, & Kate Lepore  (2026) Laser-induced breakdown spectroscopy calibration accuracies compared among four instruments, three atmospheres, and eight laser powers for 74 elements using 2157 geochemical standards. Spectrochimica Acta Part B: Atomic Spectroscopy, 243, 107571. https://doi.org/10.1016/j.sab.2026.107571 

Jack D. Henry, Kirsten L. Siebach, M. Darby Dyar, Kate H. Lepore, &  Cai R. Ytsma (2025) Predicting geochemistry in geological samples using laser-induced breakdown spectroscopy (LIBS): Effects of compositional and textural outliers. Spectrochimica Acta Part B: Atomic Spectroscopy, 235, 107376. https://doi.org/10.1016/j.sab.2025.107376

Cai R. Ytsma, M. Darby Dyar, Kate Lepore, Jane C. Watts, Jospehine L. King  (2025) Empirical portable x-ray fluorescence quantification limits and accuracies for 28 elements within 1942 diverse geological standards using open-source machine learning. Spectrochimica Acta Part B: Atomic Spectroscopy, 231, 107241. https://doi.org/10.1016/j.sab.2025.107241

Ana Torralbo, Jonathan M. Davitte, Damien C. Croteau-Chonka, Cai R. Ytsma et al. (2025) A computational framework for defining and validating reproducible phenotyping algorithms of 313 diseases in the UK Biobank. Nature - Scientific Reports, 15, 24607. https://doi.org/10.1038/s41598-025-05838-9 

Kate Lepore, M. Darby Dyar, & Cai R. Ytsma (2023) Sharing calibration information among laser-induced breakdown spectroscopy instruments using spectral line binning and calibration transfer. Spectrochimica Acta Part B: Atomic Spectroscopy, 211, 106839. https://doi.org/10.1016/j.sab.2023.106839 

M. Darby Dyar, Molly McCanta, Antonio Lanzirotti, Cody J. Steven, & Cai R. Ytsma (2023) Calibration for iron redox state and oxygen fugacity in silicate glasses from x-ray absorption spectroscopy. Chemical Geology, 635, 121605. https://doi.org/10.1016/j.chemgeo.2023.121605 

Kate Lepore, M. Darby Dyar, & Cai R. Ytsma (2023) Effect of plasma temperature on major element prediction accuracy from laser-induced breakdown spectroscopy. Geophysical Research Letters, 50(8), e2023GL102919. https://doi.org/10.1029/2023GL102919 

Cai R. Ytsma & M. Darby Dyar (2022) Calculations of and effects on quantitative limits for multivariate analyses of geological materials with laser-induced breakdown spectroscopy. Spectrochimica Acta Part B: Atomic Spectroscopy, 191, 106395. https://doi.org/10.1016/j.sab.2022.106395 

Kate Lepore, Cai R. Ytsma, & M. Darby Dyar (2022) Quantitative prediction accuracies derived from laser-induced breakdown spectra using optimized multivariate submodels. Spectrochimica Acta Part B: Atomic Spectroscopy, 191, 106408. https://doi.org/10.1016/j.sab.2022.106408 

M. Darby Dyar & Cai R. Ytsma (2021) Effect of data set size on geochemical quantification accuracy with laser-induced breakdown spectroscopy. Spectrochimica Acta Part B: Atomic Spectroscopy, 177, 106073. https://doi.org/10.1016/j.sab.2021.106073 

Cai R. Ytsma et al. (2020) Accuracies and detection limits of major, minor, and trace element quantification in rocks by portable laser-induced breakdown spectroscopy. Spectrochimica Acta Part B: Atomic Spectroscopy, 171, 105946. https://doi.org/10.1016/j.sab.2020.105946 

Cai R. Ytsma & M. Darby Dyar (2019) Accuracies of lithium, boron, carbon, and sulfur quantification in geological samples with laser-induced breakdown spectroscopy in Mars, Earth, and vacuum conditions. Spectrochimica Acta Part B: Atomic Spectroscopy, 162, 105715. https://doi.org/10.1016/j.sab.2019.105715 

Cai R. Ytsma & M. Darby Dyar (2018) Effects of univariate and multivariate regression on the accuracy of hydrogen quantification with laser-induced breakdown spectroscopy. Spectrochimica Acta Part B: Atomic Spectroscopy, 139, pp 27-37. https://doi.org/10.1016/j.sab.2017.11.010 

Laura B. Breitenfeld, M. Darby Dyar, Molly C. McCanta, Cai R. Ytsma (2026) High temperature hemispherical reflectance spectra of Venus analog samples. 57th Lunar and Planetary Science Conference, Houston, Texas. https://www.hou.usra.edu/meetings/lpsc2026/pdf/1359.pdf 

Jack D. Henry, Kirsten L. Siebach, M. Darby Dyar, Kate H. Lepore, Cai R. Ytsma (2026) How low can you go? Testing the limits of LIBS calibration data with respect to laser power, texture, and spectral intensity. 57th Lunar and Planetary Science Conference, Houston, Texas. https://www.hou.usra.edu/meetings/lpsc2026/pdf/1600.pdf 

Cai R. Ytsma (2025) Harmonising UK primary care prescription records for research: a case study in the UK Biobank. Health Data Research HDR UK Conference 2025, Glasgow, Scotland.

M. Darby Dyar, Cai R. Ytsma, et al. (2025) Understanding Venus Orbital Spectroscopy. Geological Society of America Connects GSA 2025, San Antonio, Texas. https://www.doi.org/10.1130/abs/2025AM-9810 

M. Darby Dyar, Cai R. Ytsma, et al. (2025) Rock Classification Accuracy for Venus Remote Spectroscopy. American Geophysical Union AGU25, New Orleans, Louisiana.

Kate H. Lepore, M. Darby Dyar, Cai R. Ytsma (2024) Application of post-processing methods used to improve LIBS calibration datasets. 55th Lunar and Planetary Science Conference, Houston, Texas. https://www.hou.usra.edu/meetings/lpsc2024/pdf/1084.pdf

Ana Torralbo, Cai R. Ytsma, et al. (2023) Defining and redefining human disease at scale in the UK Biobank: a framework for disease phenotyping algorithm development and evaluation. AMIA 2023 Annual Symposium, New Orleans, Louisiana.

G. Alemmano et al. (2023) Laboratory VNIR emissivity of Venus analog rocks and the VEM on VERITAS and the VenSpec-M on EnVision calibration and data verification plan. SPIE Optical Engineering + Applications, San Diego, California. https://doi.org/10.1117/12.2678683 

Cai R. Ytsma et al. (2020) Updated effects of bulk composition on prediction accuracy of trace and minor elements using an Olympus portable XRF. 51st Lunar and Planetary Science Conference, Houston, Texas. https://www.hou.usra.edu/meetings/lpsc2020/pdf/1038.pdf 

C.J. Leight, Molly C. McCanta, Cai R. Ytsma, & M. Darby Dyar (2020) Use of multivariate analysis to characterize glass composition and concentration in volcanic tephra deposits. 51st Lunar and Planetary Science Conference, Houston, Texas. https://www.hou.usra.edu/meetings/lpsc2020/pdf/2381.pdf 

Kate H. Lepore, Brenna Koretke, A. Eli Geist, Cai R. Ytsma, & M. Darby Dyar (2020). Effects of baseline removal, sample size, and correlated channel information on LIBS model accuracies for minor and trace element quantification. 51st Lunar and Planetary Science Conference, Houston, Texas. https://www.hou.usra.edu/meetings/lpsc2020/pdf/1030.pdf 

Cai R. Ytsma, Joel Hurowitz, & M. Darby Dyar (2019) LIBS and PIXL predictions accuracies for Ni, Mn, S, and major elements: A comparative study using the same standards. 50th Lunar and Planetary Science Conference, Houston, Texas. https://www.hou.usra.edu/meetings/lpsc2019/pdf/1080.pdf 

Kate H. Lepore, J. Mackie, M. Darby Dyar, Cai R. Ytsma, and Caleb I. Fassett (2017) Unreported emission lines of Ce, La, Pb, Rb, Se, Sr, Y, and Zr detected using laser-induced breakdown spectroscopy. 48th Lunar and Planetary Science Conference, Houston, Texas. https://www.hou.usra.edu/meetings/lpsc2017/pdf/1293.pdf