M. Henneaux et Aa. Slavnov, A NOTE ON THE PATH-INTEGRAL FOR SYSTEMS WITH PRIMARY AND SECONDARY 2ND CLASS CONSTRAINTS, Physics letters. Section B, 338(1), 1994, pp. 47-50
It is shown by means of the stationary phase expansion that the phase
space path integral for a system with arbitrary second class constrain
ts (primary, secondary,...) can be rewritten as a configuration space
path integral of the exponent of the Lagrangian action with some local
measure.