@article{KUTGS_1989_19_a9,
     author = {A. P. Norden},
     title = {Concomitant complex structures of a ruled space},
     journal = {Trudy Geometricheskogo Seminara},
     pages = {82--91},
     publisher = {mathdoc},
     volume = {19},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUTGS_1989_19_a9/}
}