Dr. Subbarayappa presents fresh perspectives on the continuity in the use of numerals in early inscriptions of Brāhmī and Kharoṣṭī with parallels in Indus writing. He also discusses the parallels between proto-Elamite and Rigvedic cultures.
Dr. Subhash Kak presents fresh perspectives on the continuity of glyphs used in Brāhmī script as an evolution from Indus writing. He also discusses the development of the zero sign from ancient India.
My comment is that these insights are hypotheses which should be validated by reading the inscriptions in Indus writing; the corpora now exceed over 5000 inscriptions not only in sites such as Mohenjodaro and Harappa but in newly excavated sites such as Bhirrana and Kanmer and also in ancient Near East including Persian Gulf settlements.
Kalyanaraman
Item 1. BVSubbarayappa the Rigvedic People Their Identity 1995, in LK Srinivasan and S. Nagaraju, eds., Sri Nagabhinandanam Dr. MS Nagaraja Rao Festschrift, Bangalore, Dr. MS Nagaraja Rao Felicitation Committee, pp. 83-97
http://www.scribd.com/doc/138058489/BVSubbarayappa-the-Rigvedic-People-Their-Identity-1995
BVSubbarayappa the Rigvedic People Their Identity 1995
Item 2. BVSubbaryappa Indus Numeration QJMS Vol 100 No 4 Oct Dec 2009 Indus numeration, inscriptional confirmatory evidence in Quarterly Journal of Mythical Society, Vol. 100 No. 4, Oct. - Dec. 2009
http://www.scribd.com/doc/138059142/BVSubbaryappa-Indus-Numeration-QJMS-Vol-100-No-4-Oct-Dec-2009
BVSubbaryappa Indus Numeration QJMS Vol 100 No 4 Oct Dec 2009
Item 3. Subhash Kak, 1994, Evolution of early writing in India, IJHS 29(3), 1994
http://www.scribd.com/doc/138057508/Subhash-Kak-Evolution-of-Writing-in-India-IJHS-29-3-1994