Cerroni S, Watson V, Kalentakis D, Macdiarmid JI. Value-elicitation and value-formation properties of discrete choice experiment and experimental auctions. Eur Rev Agric Econ. 2019 Feb;46(1):3-27. doi: 10.1093/erae/jby014
Luciano JV, Barrada JR, Aguado J, Osma J, García-Campayo J. Bifactor analysis and construct validity of the HADS: a cross-sectional and longitudinal study in fibromyalgia patients. Psychological Assessment. 2014 Jun;26(2):395-406.