Kotvytska, K. A., Department of Physics, Ukrainian State University of Railway Transport, Feuerbach sq 7, 61050 Kharkiv, Ukraine, Ukraine

• Journal of V. N. Karazin Kharkiv National University. Series Physics No. 30 (2019): Journal of V.N. Karazin Kharkiv National University, series "Physics" - Articles
  The number of images of a point source in an N-point gravitational lens
  Abstract  PDF