Mulligan, Christopher, Vera Cruz, Carlito, Healy, Donagh, Murphy, David, Hall, Margeret, Nelson, Quinn and Caton, Simon (2018) A Study of App User Behaviours: Transitions From Freemium to Premium. In: HCI in Business, Government, and Organizations. HCIBGO 2018. Lecture Notes in Computer Science (10923). Springer, Cham, pp. 396-412. ISBN 9783319917160
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