1. O. G. Smolyanov and E. T. Shavgulidze, Continual Integrals (Moscow State Univ., Moscow, 1990) [in Russian].
2. O. G. Smolyanov and E. T. Shavgulidze, “The Feynman Formulas for Solving Infinite-Dimensional Schrödinger Equations with Polynomial Potentials,” Doklady Russ. Akad. Nauk 390(3), 321 (2003) [Doklady Math. 67 (3), 369 (2003)].
3. O. G. Smolyanov and E. T. Shavgulidze, “Infinite-Dimensional Schrödinger Equations with Polynomial Potentials and Feynman Path Integrals,” Doklady Russ. Akad. Nauk 408(1), 28 (2006) [Doklady Math. 73 (3), 334 (2006)].
4. E. Hille and R. S. Phillips, Functional Analysis and Semi-Groups (American Math. Soc., 1957; IL, Moscow, 1962).