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Ilya V. Osipov, Alex A. Volinsky, Evgeny Nikulchev, Dmitry Plokhov       Study of monetization as a way of motivating freemium service users       Contemporary Engineering Sciences, Vol. 8, 2015, no. 20, 911-918       http://dx.doi.org/10.12988/ces.2015.57212
Copyright © 2015 Ilya V. Osipov, Alex A. Volinsky, Evgeny Nikulchev and Dmitry Plokhov. This article is distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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