Rughinis, Cosima, and Razvan Rughinis. “Influence of Daily Smoking Frequency on Passive Smoking Behaviors and Beliefs: Implications for Self-Tracking Practices and Mobile Applications”. Revista de Cercetare Si Interventie Sociala, vol. 44, Mar. 2014, pp. 116-31, https://www.rcis.ro/journal/article/view/1405-influence-of-daily-smoking-frequency-on-passive-smoking.