S. NARENDAR REDDY, M. S. G. J. G. P. M. M. and. “YIELD SUSTAINABILITY UNDER LONG TERM RICE - RICE CROPPING SYSTEM”. The Journal of Research, PJTSAU, vol. 47, no. 2, Aug. 2019, https://epubs.icar.org.in/index.php/TJRP/article/view/92541.