NIST Atomic Spectra Database, https://www.nist.gov/pml/atomic-spectra-database
Griem's Electron Impact Parameters, https://griem.obspm.fr/index.php?page=accueil.php
Thorlabs, Inc., https://www.thorlabs.com/
Journal Citation Reports by Clarivate, https://jcr.clarivate.com/jcr/home
Journal Abbreviations, https://cassi.cas.org/search.jsp, https://woodward.library.ubc.ca/woodward/research-help/journal-abbreviations/, https://impactfactorforjournal.com/journal-abbreviation/
NIST Standard Reference Materials, https://www.nist.gov/srm
Error propagation calculator, https://www.eoas.ubc.ca/courses/eosc252/error-propagation-calculator-fj.htm
Spectroscopy World Magazine, https://www.spectroscopyworld.com
European Virtual Institute for Speciation Analysis, http://www.speciation.net/
Spectroscopy Online, https://www.spectroscopyonline.com/