Μιχαλόπουλος Β., and Δεμούσης Μ. “An Infrequency of Purchase Model of Greek Household Clothing and Footwear Consumption With Error Dependence”. SPOUDAI Journal of Economics and Business, vol. 52, no. 3, Sept. 2002, pp. 85-99, http://spoudai.org/index.php/journal/article/view/460.