@article{HammerschmidtZeitlerLeidl2003, author = {Hammerschmidt, Thomas and Zeitler, H. P. and Leidl, R.}, title = {Unexpected yes- and no-answering behaviour in the discrete choice approach to elicit willingness to pay: a methodological comparison with payment cards}, series = {International Journal of Health Care Finance and Economics}, journal = {International Journal of Health Care Finance and Economics}, number = {3 / 3}, pages = {147 -- 166}, year = {2003}, language = {en} }