Remarks on the classification of a pair of commuting semilinear   operators
  Gelfand and Ponomarev [Functional Anal. Appl. 3 (1969) 325-326] proved that the problem of classifying pairs of commuting linear operators contains the problem of classifying k-tuples of linear operators for any k. We prove an analogous statement for semilinear operators. 
Debora Duarte de Oliveira, Roger A. Horn, Tatiana Klimchuk, Vladimir   V. Sergeichuk
math.RT