Pietro Piazzolla Marco Gribaudo Alberto Messina Stochastic Modelling of Poll Based Multimedia Productions. 370-385 2009 ASMTA http://dx.doi.org/10.1007/978-3-642-02205-0_26 conf/asmta/2009 db/conf/asmta/asmta2009.html#PiazzollaGM09