I. Zhukov, E. Lysenko, “Construction of cyclic extensions of degree $p^2$ for a complete field”, Zap. Nauchn. Sem. POMI, 455 (2017), 52–66; J. Math. Sci. (N. Y.), 234:2 (2018), 148–157
E. F. Lysenko, “Ramification of cyclic extensions of degree $p^2$ of complete discrete valuation fields of prime characteristic $p$ with imperfect residue field”, Zap. Nauchn. Sem. POMI, 413 (2013), 153–172; J. Math. Sci. (N. Y.), 202:3 (2014), 434–447
Contact us: