Everyday favors: a case study of a local online gift exchange system. - Emmi Suhonen; Airi Lampinen; Coye Cheshire; Judd Antin (GROUP, 2010)

Indebtedness, reciprocity, and fairness in local online exchange. - Airi Lampinen; Vilma Lehtinen; Coye Cheshire; Emmi Suhonen (CSCW, 2013)