Alphabetically:
@Article{webb+2020, author = {Webb, M. P. K. and Sidebotham, D.}, title = {{Bayes'} formula}, journal = {{BJA} Education}, year = 2020, volume = 20, number = 6, pages = {208-213}, month = jun, subtitle = {A powerful but counterintuitive tool for medical decision-making}, publisher = {{Elsevier BV}}, doi = {10.1016/j.bjae.2020.03.002}, keywords = {math} }
@Book{levin-2021, author = {Oscar Levin}, title = {Discrete Mathematics}, publisher = {Self-published}, year = 2021, edition = {3th Edition, 5th Printing}, subtitle = {An Open Introduction}, URL = {http://discrete.openmathbooks.org}, keywords = {math} }
@Unpublished{peirce-1895, author = {Benjamin Peirce}, title = {On quantity, with special reference to Collectional and Mathematical Infinity}, note = {From the Robin Catalogue: A. MS., n.p., [c.1895], pp. 1-29, incomplete. Same questions raised as in MS. 14. "Mathematics" defined, with extended comments on the divisions of the sciences. Published as NEM 4:265-284.}, year = {ca. 1895}, type = {unpublished manuscript}, keywords = {math/aux} }
@Book{galilei-1623, author = {Galileo Galilei}, title = {The Assayer}, publisher = {Lynx}, year = 1623, keywords = {math/aux} }
@Misc{weisstein-, author = {Weisstein, Eric W.}, title = {Wolfram {MathWorld}}, publisher = {{Wolfram} Research}, url = {https://mathworld.wolfram.com/}, keywords = {math} }