1. 1) "India Coal Development Plan and its Effect on the World Coal Market" (NEDO report, March 2006) .
2. 2) S.Bhattacharya, Ashim Kumar Maitra: "Rail Transport of Coal in India: Coal Quality and Economics", Proc XV International Coal Preparation Congress and Exhibition in Beijing, 2006.
3. 3) Ashok K Singh, Kalyan Sen, S.K. Hazra: "Challenge before Indian steel & power industries-some programmatic solution", Proc PCC 2005-22nd International Pittsburgh Conference, USA.
4. 4) Coal India Web site, http://coalindia.nic.in/
5. 5) H. Endo and N. Koyanagi: "Look at Indian Coal Situation Through The Coal Preparation Technology" (Japan Coal Energy Center, 2007) .