@article{AA_2000_12_1_a4,
     author = {K. V. Zainullin},
     title = {On {Grothendieck's} conjecture on principal homogeneous spaces for some classical algebraic groups},
     journal = {Algebra i analiz},
     pages = {150--184},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2000_12_1_a4/}
}