@article{oai:tsukuba.repo.nii.ac.jp:00015900,
 author = {Morita, Jun},
 issue = {2},
 journal = {Tsukuba Journal of Mathematics},
 month = {Dec},
 pages = {41--51},
 title = {Tits' systems in Chevalley groups over Laurent polynomial rings},
 volume = {3},
 year = {1979}
}