@Article{zbMATH05568494,
Author = {Gaohua {Tang} and Huadong {Su} and Beishang {Ren}},
Title = {{Commutative zero-divisor semigroups of graphs with at most four vertices.}},
FJournal = {{Algebra Colloquium}},
Journal = {{Algebra Colloq.}},
ISSN = {1005-3867; 0219-1733/e},
Volume = {16},
Number = {2},
Pages = {341--350},
Year = {2009},
Publisher = {World Scientific, Singapore; Chinese Academy of Sciences, Academy of Mathematics \& Systems Science, Beijing; Suzhou University, Suzhou},
Language = {English},
MSC2010 = {20M14 05C25 05C90},
Zbl = {1171.20037}
}