[Air-L] Looking for papers on sharing culture

Hello everyone, I am looking for papers/research on the emerging culture and technological infrastructure of sharing --- e.g., car sharing, bike sharing, ride sharing, time banks, etc. Beyond journalistic accounts, I am not having much luck, so if anyone is aware of papers on the topic, I'd much grateful. Many thanks in advance, Jean-François Blanchette -- Jean-François Blanchette, Associate Professeur Dept. of Information Studies, UCLA http://polaris.gseis.ucla.edu/blanchette