Open-source QSAR models for pKa prediction using multiple machine learning approaches. - Kamel Mansouri; Neal F. Cariello; Alexandru Korotcov; Valery Tkachenko; Christopher M. Grulke; Catherine S. Sprankle; David G. Allen; Warren M. Casey; Nicole C. Kleinstreuer; Antony J. Williams (J. Cheminformatics, 2019)