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[1]
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[3]
CAYLEY A, 1889, COLLECTED MATH PAPER, V13, P26
[5]
FOSTER RM, 1950, P INT C MATH, V1, P646
[6]
Harary F., 1955, T AM MATH SOC, P445
[9]
[No title captured]
[10]
[No title captured]