Geodesic
Principal nets of parallel and normal correspondence of surfaces in $E_4$
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1968), pp. 81-91 
L. N. Krivonosov. Principal nets of parallel and normal correspondence of surfaces in $E_4$. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1968), pp. 81-91. http://geodesic.mathdoc.fr/item/IVM_1968_1_a10/
@article{IVM_1968_1_a10,
     author = {L. N. Krivonosov},
     title = {Principal nets of parallel and normal correspondence of surfaces in $E_4$},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {81--91},
     year = {1968},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1968_1_a10/}
}
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