no. 1
The point-outerthickness of complete n-partite graphs
Compositio Mathematica, Tome 29 (1974) no. 1, pp. 55-61. 
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Mitchem, John. The point-outerthickness of complete $n$-partite graphs. Compositio Mathematica, Tome 29 (1974) no. 1, pp. 55-61. http://www.numdam.org/item/CM_1974__29_1_55_0/

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