@article{DAN_1961_141_1_a7,
     author = {D. B. Potyagailo},
     title = {The sewing problem for two semi-circles},
     journal = {Doklady Akademii Nauk},
     pages = {32--35},
     publisher = {mathdoc},
     volume = {141},
     number = {1},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_141_1_a7/}
}