1. V. V. Belokurov and E. T. Shavgulidze, Paths with Singularities in Functional Integrals of Quantum Field Theory, arXiv: https://arxiv.org/abs/1112.3899 (2013).
2. V. V. Belokurov and E. T. Shavgulidze, J. Math. Sci. (N. Y.) 248 (5), 544 (2020).
3. V. V. Belokurov and E. T. Shavgulidze, Chebyshevskii Sb. 21 (2), 37 (2020).
4. D. V. Grishin and Ya. Yu. Pavlovskii, Izv. Math. 85 (1), 24 (2021).
5. A. A. Fedotov, Math. Notes 109 (6), 990 (2021).