@article{MT_2007_10_2_a3,
     author = {Yu. L. Ershov},
     title = {Two {Theorems} on {Defect-Freeness} for {Cyclic} {Extensions}},
     journal = {Matemati\v{c}eskie trudy},
     pages = {92--111},
     publisher = {mathdoc},
     volume = {10},
     number = {2},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_2007_10_2_a3/}
}