%0 Journal Article %A E. F. Lysenko %T Ramification of cyclic extensions of degree $p^2$ of complete discrete valuation fields of prime characteristic $p$ with imperfect residue field %J Zapiski Nauchnykh Seminarov POMI %D 2013 %P 153-172 %V 413 %U http://geodesic.mathdoc.fr/item/ZNSL_2013_413_a7/ %G ru %F ZNSL_2013_413_a7