Annamalai, Nagappan; Kamaruddin, Shahrul; Azid, Ishak Abdul; Yeoh, TS. Importance of Problem Statement in Solving Industry Problems. Applied Mechanics and Materials (Zurich). September 2013, 421: 857–863. S2CID 60791623. doi:10.4028/www.scientific.net/AMM.421.857.
Annamalai, Nagappan; Kamaruddin, Shahrul; Azid, Ishak Abdul; Yeoh, TS. Importance of Problem Statement in Solving Industry Problems. Applied Mechanics and Materials (Zurich). September 2013, 421: 857–863. S2CID 60791623. doi:10.4028/www.scientific.net/AMM.421.857.