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2. Andersson, D. (2013). Authentication with passwords and passphrases: implication on usability and security. http://www.rlvision.com/blog/authentication-with-passwords-passphrases-implications-on-usability-and-security/
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4. Effects coding in discrete choice experiments;Bech;Health Econ,2005
5. Discrete choice analysis: theory and application to travel demand;Ben-Akiva,1985