@article{ZNSL_2021_506_a18,
     author = {M. M. Popov},
     title = {Corrigendum to {``On} the {Morse} index for geodesic lines on smooth surfaces embedded in $\mathbb R^3$''},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {293--294},
     publisher = {mathdoc},
     volume = {506},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2021_506_a18/}
}