We consider the description of second-class constraints in a Lagrangia
n path integral associated with a higher-order Delta-operator. Based o
n two conjugate higher-order Delta-operators, we also propose a Lagran
gian path integral with Sp(2) symmetry, and describe the corresponding
system in the presence of second-class constraints. (C) 1997 Publishe
d by Elsevier Science B.V.