@article{ZNSL_2013_413_a7,
     author = {E. F. Lysenko},
     title = {Ramification of cyclic extensions of degree $p^2$ of complete discrete valuation fields of prime characteristic~$p$ with imperfect residue field},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {153--172},
     year = {2013},
     volume = {413},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2013_413_a7/}
}