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[1]
ASH RB, 1959, J FRANKLIN I, V268, P453
[6]
HARARY F, 1959, MATH ANN, V138, P208
[7]
ORE O, 1945, FESTSCHRIFT ZUM 60 G, P184
[8]
ORE O, 1961, J MATH PURES APPL, V40, P123
[9]
ORE O, 1962, COLLOQUIUM PUBLICATI, V38
[10]
[No title captured]