Shaukat, S. S., M. A. Khan, S. Zaidi, M. F. Siddiqui, N. Khan, and H. Zafar. “Reproductive Effort of Some Annual and Perennial Plant Species: Impact of Successional Sequence, Habitat Conditions and Plant Size: Impact of Successional Sequence on Plants”. Biological Sciences - PJSIR, vol. 56, no. 3, Dec. 2013, pp. 117-28, doi:10.52763/PJSIR.BIOL.SCI.56.3.2013.117.128.