thanks for the answer. I already have the above article in full, however i have not written to the authors, i will do that and hope to get the answers from them as well. Google scholar articles contain only abstracts and the full articles are available for only a price and not free. As a student i cannot afford to buy each and every article though they may useful. Secondly, my library in Chennai, India do not subscribe to these journals and hence i am unable to get the majority of the above articles free of cost for my research purpose. Anyway, thanks for the answer and look forward to a long term association with you people.

kothandaraman