@misc{stewart_2018_1229233, author = {Stewart, James J. P.}, title = {{Optimization of parameters for semiempirical methods, Part 3: extension of PM3 to Be, Mg, Zn, Ga, Ge, As, Se, Cd, In, Sn, Sb, Te, Hg, Tl, Pb, and Bi}}, month = apr, year = 2018, publisher = {Zenodo}, doi = {10.1002/jcc.540120306}, url = {https://doi.org/10.1002/jcc.540120306} }