A. Greshof and Doy (1972)
B. Tyagi and Prasad (1965)
C. Mehta and Upadhya (1960)
D. Singh (1960)
Correct Answer: Greshof and Doy (1972) ✔
Last Updated: July 02, 2019
A. Greshof and Doy (1972)
B. Tyagi and Prasad (1965)
C. Mehta and Upadhya (1960)
D. Singh (1960)
Correct Answer: Greshof and Doy (1972) ✔
Last Updated: July 02, 2019