@article{oai:tsukuba.repo.nii.ac.jp:00016848,
 author = {Cao, Zhenfu and Grytczuk, Aleksander},
 issue = {3},
 journal = {Tsukuba Journal of Mathematics},
 month = {Dec},
 pages = {637--643},
 title = {Fermat's type equations in the set of 2 × 2 integral matrices},
 volume = {22},
 year = {1998}
}