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"Transposing freemium business model from casual games to serious games."
Gergana Georgieva et al. (2015)
- Gergana Georgieva, Sylvester Arnab, Margarida Romero, Sara de Freitas:
Transposing freemium business model from casual games to serious games. Entertain. Comput. 9-10: 29-41 (2015)
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