The path integral representation kernel of evolution operator in   Merton-Garman model
  In the framework of path integral the evolution operator kernel for the Merton-Garman Hamiltonian is constructed. Based on this kernel option formula is obtained, which generalizes the well-known Black-Scholes result. Possible approximation numerical schemes for path integral calculations are proposed. 
L. F. Blazhyevskyi, V. S. Yanishevsky
math-ph math.MP q-fin.PR