@article{SM_1967_1_2_a0,
     author = {Yu. I. Manin},
     title = {Rational surfaces over perfect fields. {II}},
     journal = {Sbornik. Mathematics},
     pages = {141--168},
     year = {1967},
     volume = {1},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1967_1_2_a0/}
}