CANONICAL FORMULATION OF GRAVITATION THEORY AND GENERAL COVARIANT SPLITTING OF SPACE AND TIME ArticleMITSKIEVIC N.V., NESTEROV A.I.IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII FIZIKA / Russian Physics Journal. 1977. С. 15-20
MOTION OF A PHOTON IN GRAVITATIONAL-FIELD ArticleEPIKHIN E.N., MITSKIEVIC N.V.Acta Physica Polonica B. Том 7. 1976. С. 543-552