@article{MZM_1975_17_2_a7,
     author = {A. A. Panchishkin},
     title = {There exist no {Ramanujan} congruences $\mod691^2$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {255--263},
     publisher = {mathdoc},
     volume = {17},
     number = {2},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1975_17_2_a7/}
}