@article{Egorov:1982,author = {G. S. Egorov and N. S. Stepanov},title = {Simulation of a gravitational lens in a lecture demonstration},publisher = {Uspekhi Fizicheskikh Nauk},year = {1982},journal = {Usp. Fiz. Nauk},volume = {138},number = {9},pages = {147-150},url = {https://ufn.ru/ru/articles/1982/9/e/},doi = {10.3367/UFNr.0138.198209e.0147}}