@article{IVM_1962_1_a8,
     author = {\"U. G. Lumiste and L. A. Tuulmets},
     title = {Minimal congruences $V_3$ in the {Euclidean} space $R_4$},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {74--82},
     publisher = {mathdoc},
     number = {1},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1962_1_a8/}
}