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Hassan Kassim, . Behavioural ecology of barking deer (Muntiacus muntjak) in the Ulu Lepar Valley Pahang Darul Makmur. pp. 67-78. ISSN 0121-8126
Hassan Kassim, . and Udadin Keling, . Dependence of Elephas maximus on rural agriculture. pp. 92-104.
Mokhtar Muhamad, . and Aziz Che Man, . and Saidu Wahid, . and Hassan Kassim, . and Rahmat Topani, . and Ebil Yusof, . Large mammal survey at Krau Wildlife Reserve Pahang. pp. 89-95. ISSN 0121-8126
Hassan Kassim, . Pemerhatian awalan gajah jinak yang di pindahkan ke Tasek Kenyir Terengganu Darul Iman. pp. 8-16. ISSN 0121-8126
Shahruddin Othman, . and Hassan Kassim, . and Mohd.Tajuddin Abdullah, . and Burhanuddin Mohd. Nor, . and Samsuddin Suri, . A survey on the distribution of large mammals in Endau Rompin State Park Johor. pp. 16-25. ISSN 0121-8126
Mohd Zulkifli Arshad, . and Hassan Kassim, . (2002) Taman Negara Peninsular Malaysia : management and operation. [Proceedings Paper]