Kai K. Kimppa, Olli I. Heimo, J. Tuomas Harviainen. First dose is always freemium. SIGCAS Computers and Society, 45(3):132-137, 2015. [doi]
@article{KimppaHH15,
title = {First dose is always freemium},
author = {Kai K. Kimppa and Olli I. Heimo and J. Tuomas Harviainen},
year = {2015},
doi = {10.1145/2874239.2874258},
url = {http://doi.acm.org/10.1145/2874239.2874258},
researchr = {https://researchr.org/publication/KimppaHH15},
cites = {0},
citedby = {0},
journal = {SIGCAS Computers and Society},
volume = {45},
number = {3},
pages = {132-137},
}