@unpublished{Gup-06,
        title = {The Value of a ``Free'' Customer},
        author = {Sunil Gupta and Carl Mela and Jos{\'e} Vidal-Sanz},
        note = {http://www.hbs.edu/research/pdf/07-035.pdf},
        year = 2006,
        url = {http://www.hbs.edu/research/pdf/07-035.pdf},
        added = {2007-06-11 17:22:07 +0200},
	read = {Yes},
	rating = {5},
	uri = {papers://C3B117CD-23C4-4854-9426-AC96AFB113DA/Paper/p184},
	modified = {2007-06-11 17:22:06 +0200},
	description = {March 2008},
	biburl = {http://www.bibsonomy.org/bibtex/23a818cc0ead6bcf7fcfbdad985169af7/bertil.hatt},
	keywords = {Customer Programming Lifetime Optimal Dynamic Control; Value; CRM;}
}