@article{MZM_1997_61_4_a6,
     author = {S. Sh. Kozhegel'dinov},
     title = {Basic {Theonean} triangles},
     journal = {Matemati\v{c}eskie zametki},
     pages = {561--569},
     year = {1997},
     volume = {61},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1997_61_4_a6/}
}