@article{MT_1993_25_a6,
     author = {S. T. Fedoryaev},
     title = {Countability of the width of structures of algebraic reducibility for models of some classes},
     journal = {Matemati\v{c}eskie trudy},
     pages = {133--154},
     year = {1993},
     volume = {25},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_1993_25_a6/}
}