http://www.iosrjournals.org/iosr-jm/papers/vol12-issue6/version-2/f1206023239.pdf
http://nobobarta.com/%e0%a6%97%e0%a6%a3%e0%a6%bf%e0%a6%a4%e0%a7%87%e0%a6%b0-%e0%a6%a8%e0%a6%a4%e0%a7%81%e0%a6%a8-%e0%a6%b8%e0%a7%82%e0%a6%a4%e0%a7%8d%e0%a6%b0-%e0%a6%ac%e0%a6%bf%e0%a6%b6%e0%a7%8d%e0%a6%ac%e0%a6%95/
http://nobobarta.com/%e0%a6%97%e0%a6%a3%e0%a6%bf%e0%a6%a4%e0%a7%87%e0%a6%b0-%e0%a6%a8%e0%a6%a4%e0%a7%81%e0%a6%a8-%e0%a6%b8%e0%a7%82%e0%a6%a4%e0%a7%8d%e0%a6%b0-%e0%a6%ac%e0%a6%bf%e0%a6%b6%e0%a7%8d%e0%a6%ac%e0%a6%95/
http://bhalukanews.com/archives/8892
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