Pankaj Chowdhury, Puskar Gupta, Manoj Kumar, Pramod K. Bajpai, et al.. "Study on Improving the Opacity of Paper Using Adjunct Filler Pigments" Indian Pulp and Paper Technical Association (IPPTA) Vol. 17 Iss. 3 (2005)
Available at: http://works.bepress.com/pankaj_chowdhury_western_university/12/