@article{MZM_1993_54_1_a0,
     author = {A. N. Zubkov and V. T. Fomenko},
     title = {Surfaces in {Euclidean} space with planar normal connectivity and zero normal torsion},
     journal = {Matemati\v{c}eskie zametki},
     pages = {3--16},
     publisher = {mathdoc},
     volume = {54},
     number = {1},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1993_54_1_a0/}
}