@article{MT_1989_16_a2,
     author = {I. L. Kantor},
     title = {Some problems in $\mathfrak{L}$-functor theory},
     journal = {Matemati\v{c}eskie trudy},
     pages = {54--75},
     publisher = {mathdoc},
     volume = {16},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_1989_16_a2/}
}