@article{oai:tsukuba.repo.nii.ac.jp:00016183,
 author = {Nowicki, Andrzej},
 issue = {2},
 journal = {Tsukuba Journal of Mathematics},
 month = {Dec},
 pages = {227--253},
 title = {Higher R-derivations of special subrings of matrix rings},
 volume = {8},
 year = {1984}
}