@article{ZNSL_2000_272_a21,
     author = {V. M. Tsvetkov},
     title = {A simple example of extensions without an integral basis},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {341--344},
     publisher = {mathdoc},
     volume = {272},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2000_272_a21/}
}