@article{oai:tsukuba.repo.nii.ac.jp:00015825,
 author = {Nowicki, Andrzej},
 issue = {2},
 journal = {Tsukuba Journal of Mathematics},
 month = {Dec},
 pages = {281--297},
 title = {Derivations of special subrings of matrix rings and regular graphs},
 volume = {7},
 year = {1983}
}