AKHTAR, L.H. and MIRZA, M.A. 1997. ?EFFECT OF INITIAL CALLUS SIZE/QUANTITY, AGAR, PHYTAGEL ANDTHIAMINE ON FURTHER GROWTH OF LEAF AND PETIOLE-DERIVED CALLUS CULTURES OF GOSSYPIUMHIRSUTUM L. Biological Sciences - PJSIR. 40, 1-4 (Apr. 1997), 1–3.