Arshad Ali Ashiq Anjum Tahir Azim Julian J. Bunn Ahsan Ikram Richard McClatchey Harvey B. Newman Conrad Steenberg Michael Thomas Ian Willers http://arxiv.org/abs/0707.0742 2007 CoRR abs/0707.0742 db/journals/corr/corr0707.html#abs-0707-0742 informal publication