%0 Journal Article
%T INTEGRAL TREES OF DIAMETER 4<br>直径为4的整树
%A Yuan Pingzhi
%A <br>袁平之
%J 系统科学与数学
%D 1998
%I 
%X in this paper, we give a sufficient condition for graphs to be the integral treesof diameter 4. Many new types of integral trees of diameter 4 are given by using this condition.Finally, we propose several basic open problems.
%K Integral trees of diameter 4
%K spectra of graphs
%K diophantine equations<br>直径为4的整树
%K 图谱
%K 丢番图方程
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=37F46C35E03B4B86&jid=0CD45CC5E994895A7F41A783D4235EC2&aid=764516F78042B051D2DF5E5D26D7F51C&yid=8CAA3A429E3EA654&vid=13553B2D12F347E8&iid=0B39A22176CE99FB&sid=6425DAE0271BB751&eid=7EBE588F611589FC&journal_id=1000-0577&journal_name=系统科学与数学&referenced_num=3&reference_num=0