1. http://dst.gov.in/sites/default/files/fly_ash_signing_brief_with_photo.pdf
2. https://www.manage.gov.in/pgdaem/studymaterial/aem205.pdf
3. http://www.psuconnect.in/news/NTPC-Signs-Pact-with-Indian-Railways-for-Fly-Ash-Transportation/17593
4. https://www.downtoearth.org.in/news/agriculture/moefcc-revises-fly-ash-notification-53260
5. Fly ash and lime-stabilized biosolid mixtures in mine spoil reclamation: simulated weathering;Abbott;J. Environ. Qual.,2001