Shin Hattori, “Ramification correspondence of finite flat group schemes over equal and mixed characteristic local fields”, Journal of Number Theory, 132, no. 10, 2012, 2084
YOSHIYASU OZEKI, “ON GALOIS EQUIVARIANCE OF HOMOMORPHISMS BETWEEN TORSION CRYSTALLINE REPRESENTATIONS”, Nagoya Math. J., 229, 2018, 169
Victor Abrashkin, “Group schemes of period 2”, manuscripta math., 143, no. 3-4, 2014, 317