Can anyone recommend me a list of "must read papers" that can help me to well understand the concept of using Machine Learning techniques in Named entity recongnition field?
I'm not giving you a single paper, there's too much around and you are going to have to tailor your reading to your specific research area. However, I do recommend you start by looking at some of the named entity material in answering factoid questions in Trec-QA. This should show you the direction: http://trec.nist.gov/pubs/trec11/papers/lia.sinequa.pdf
Also name recognition is Arabic is fun, look at
A. Elsebai, F. Meziane and F.Z. Belkredim (2009), A Rule Based Persons Names Arabic Extraction System, Proceedings of the 11th International Business Information Management Association Conference (IBIMA 2009), Special Track on Arabic Information Processing, pp. 1205-1211, Cairo, Egypt 4-6 January 2009. ISBN 978-0-9821489-0-7.
and
A. Elsebai, F. Meziane (2008), Extracting Persons Names from Arabic Newspaper, Proceedings of the 5th international conference on Innovations in Information Technology, Dubai, United Arab Emirates, 16-18 December 2008.
Look out for more recent papers, I think I reviewed a more recent conference paper on the topic by Meziane's group.