help me!



I am eager to study the following two papers:

1.Harper, L. (1964): "Optimal Assignment of Numbers to Vertices". In:
Journal of SIAM 12 (1), 131--135.

2.L. Harper. Optimal numberings and isoperimetric problems on graphs.
Journal of Combinatorial Theory 1:385--394, 1966

Are there anyone who can help me to find these two papers? I will
appreciate very much if you do so.

.



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