Akshar Bharati Vineet Chaitanya Amba P. Kulkarni Rajeev Sangal G. Umamaheshwara Rao http://arxiv.org/abs/cs.CL/0308018 2003 CoRR cs.CL/0308018 db/journals/corr/corr0308.html#cs-CL-0308018 informal publication