A maximum principle for graphs

Journal of Combinatorial Theory - Tập 3 - Trang 34-37 - 1967
R.C. Lyndon1
1Department of Mathematics, University of Michigan, Ann Arbor, Michigan 48104, USA

Tài liệu tham khảo

Lyndon, 1966, On Dehn's Algorithm, Math. Ann., 166, 208, 10.1007/BF01361168