@article{DAN_1969_184_2_a5,
     author = {G. I. Perel'muter},
     title = {A certain conjecture of {K.~Williams}},
     journal = {Doklady Akademii Nauk},
     pages = {282--284},
     publisher = {mathdoc},
     volume = {184},
     number = {2},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_184_2_a5/}
}