On Morse index for geodesic lines on smooth surfaces imbedded in $\mathbb R^3$
M. M. Popov

This publication is cited in the following articles:

1. M. M. Popov, “Popravka k state "Ob indekse Morsa geodezicheskikh na gladkikh poverkhnostyakh, vlozhennykh v $\mathbb R^3$"”, Matematicheskie voprosy teorii rasprostraneniya voln. 51, Zap. nauchn. sem. POMI, 506, POMI, SPb., 2021, 293–294  
2. M. M. Popov, “Novaya kontseptsiya poverkhnostnykh voln interferentsionnogo tipa dlya gladkikh strogo vypuklykh poverkhnostei, vlozhennykh v $\mathbb R^3$”, Matematicheskie voprosy teorii rasprostraneniya voln. 50, Posvyaschaetsya devyanostoletiyu Vasiliya Mikhailovicha BABIChA, Zap. nauchn. sem. POMI, 493, POMI, SPb., 2020, 301–313