M. Deleon et al., A NEW LOOK AT DEGENERATE LAGRANGIAN DYNAMICS FROM THE VIEWPOINT OF ALMOST-PRODUCT STRUCTURES, Journal of physics. A, mathematical and general, 28(17), 1995, pp. 4951-4971
Singular Lagrangian systems are studied in the framework of almost-pro
duct structures. The choice of an appropriate almost-product structure
permits us to obtain the dynamics. The relationship with the Dirac br
acket is also elucidated.