Number 12

Authors: M. I. Moussa , E. M. Badr

Authors: B. Pushpa Devi , Kh.manglem Singh , Sudipta Roy

Authors: U. B. Mahadevaswamy , M. N. Shanmukhaswamya

Authors: O. M. Elzeki , M. Z. Reshad , M. A. Elsoud

Authors: Pratap Singh , T.p. Sharma , Ishwar Chand

Authors: Ahmed Salah , Kenlili , Tarek F. Gharib , Abdul Fattah Mashat

Authors: B. Thiyaneswaran , S. Padma

Authors: Karamitsos Ioannis , Al-arfaj Khalid