Pratinidhi, Asha K Field Testing of Second Generation of Colour-Coded Rings for Detecting Slow Progress of Labour at Rural Health Centres. [electronic resource] - Journal of obstetrics and gynaecology of India Oct 2016 - 263-70 p. digital Publication Type: Journal Article ISSN: 0971-9202 Standard No.: 10.1007/s13224-016-0873-3 doi