Assoc. Prof. Ts. Dr. Shahrul Kadri Ayop,
Department of Physics, FSM,
Sultan Idris Education University,
35900 Tg Malim, Perak, MALAYSIA
email me : kadrimy 'at' gmail.com
Office:Â +6 05 450 7529 (Landline telephone, no Whatsapp / Telegram)
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