6Yew-Kwang. Ng, 1996: Happiness Surveys: Some Comparability Issues and An Exploratory Survey Based on Just Perceivable Increments, Social Indicators Research 38, pp. 1 - 27.
7Experienced utility and objective happiness: A moment-based approach. Ch. 37 in Kahneman, D and Tversky, A. (Eds.), Choices, Values and Frames. New York: Cambrige University Press and the Russell Sage Foundation, 2000, 673 - 692.
8Ed sandvik, Ed Diener, & Larry seldlitz. Subjective wen-being: The convergence and stability of self-report and non-self-report measures. Journal of porsonality, 1993:61 (3): 318-342.
