@article{DAN_1977_236_1_a4,
     author = {Yu. T. Lisitsa},
     title = {On the exactness of the spectral homotopy group sequence in shape theory},
     journal = {Doklady Akademii Nauk},
     pages = {23--26},
     publisher = {mathdoc},
     volume = {236},
     number = {1},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_236_1_a4/}
}