Sial, Z.K. and Khan, F. 2019. BIOLOGICAL CONVERSION OF POTATO SPINDLE TUBER VIROID (PSTVD) RNA INTO NONINFECTIOUS ENTITY BY A SINGLE BASE SUBSTITUTION IN NICOTIANA BENTHAMIANA VAR DOMIN. Pakistan Journal of Phytopathology. 31, 1 (Jun. 2019), 113-118. DOI:https://doi.org/10.33866/phytopathol.031.01.0473.