Identifying hedonic factors in long-term user experience. - Sari Kujala; Virpi Roto; Kaisa Väänänen-Vainio-Mattila; Arto Sinnelä (DPPI, 2011)

UX Curve: A method for evaluating long-term user experience. - Sari Kujala; Virpi Roto; Kaisa Väänänen-Vainio-Mattila; Evangelos Karapanos; Arto Sinnelä (Interact. Comput., 2011)