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MR Erdos Number = 4
Masahito Hasegawa coauthored with Robert A. G. Seely MR2272175 (2008a:03105)
Robert A. G. Seely coauthored with Michael Barr MR1771048
Michael Barr coauthored with Michael Makkai MR0889111 (88f:18005)
Michael Makkai coauthored with Paul Erdős1 MR0209167 (35 #70)
 
 
American Mathematical Society