Marcelo Coelho Lyndl Hall Joanna Berzowska Pattie Maes Pulp-based computing: a framework for building computers out of paper. 3527-3528 2009 CHI Extended Abstracts http://doi.acm.org/10.1145/1520340.1520525 conf/chi/2009a db/conf/chi/chi2009a.html#CoelhoHBM09