Deepak P 0001 Anuradha Bhamidipaty Optimizing on Mobile Usage Cost for the Lower Income Group: Insights and Recommendations. 339-342 2007 conf/interact/2007-1 INTERACT (1) https://doi.org/10.1007/978-3-540-74796-3_31 db/conf/interact/interact2007-1.html#PB07