http://www.wipo.int/export/sites/www/tk/en/databases/tkportal/presentations/indiatkdl.pdf
http://www.tkdl.res.in/tkdl/langdefault/common/home.asp?GL=Eng
http://www.pbs.org/newshour/bb/asia/jan-june07/patents_05-21.html
http://www.tkdl.res.in/tkdl/langdefault/common/home.asp?GL=Eng
http://www.pbs.org/newshour/bb/asia/jan-june07/patents_05-21.html