Geodesic
The false coin identification problem
Fundamentalʹnaâ i prikladnaâ matematika, Tome 1 (1995) no. 2, pp. 561-563.

Voir la notice de l'article provenant de la source Math-Net.Ru

The problem of how to identify a false coin using minimal number of weighings on a balance (with scales and without weights) is under consideration. It is unknown whether the false coin is heavier or lighter. Determining the difference in weight is not required. 
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     author = {D. A. Mihalin and I. M. Nikonov},
     title = {The false coin identification problem},
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D. A. Mihalin; I. M. Nikonov. The false coin identification problem. Fundamentalʹnaâ i prikladnaâ matematika, Tome 1 (1995) no. 2, pp. 561-563. http://geodesic.mathdoc.fr/item/FPM_1995_1_2_a20/