@article{DAN_1989_306_1_a4,
     author = {D. Yu. Grigor'ev},
     title = {The complexity of computing the genus of a system of exterior},
     journal = {Doklady Akademii Nauk},
     pages = {26--30},
     publisher = {mathdoc},
     volume = {306},
     number = {1},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_306_1_a4/}
}