A~two-level assignment problem
Diskretnyj analiz i issledovanie operacij, Tome 8 (2001) no. 2, pp. 42-51.

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     author = {R. M. Larin and A. V. Pyatkin},
     title = {A~two-level assignment problem},
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}
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R. M. Larin; A. V. Pyatkin. A~two-level assignment problem. Diskretnyj analiz i issledovanie operacij, Tome 8 (2001) no. 2, pp. 42-51. http://geodesic.mathdoc.fr/item/DA_2001_8_2_a4/