NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA B-GENERAL PHYSICS RELATIVITY ASTRONOMY AND MATHEMATICAL PHYSICS AND METHODS, vol.107, no.12, pp.1389-1395, 1992 (SCI-Expanded)
Singular classical systems are studied by the equivalent Lagrangians method. The method leads us to a set of Hamilton-Jacobi partial differential equations. Total differential equations in many variables are obtained as equations of motion.