Rafiq, Muhammad Khalid Pyrolysis of attapulgite clay blended with yak dung enhances pasture growth and soil health: Characterization and initial field trials. [electronic resource] - The Science of the total environment Dec 2017 - 184-194 p. digital Publication Type: Journal Article ISSN: 1879-1026 Standard No.: 10.1016/j.scitotenv.2017.06.186 doi