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Abdullah, A. H., Ibrahim, N. H., Surif, J., Ali, M., & Hamzah, M. H. (2014). Non-routine mathematical problems among in-service and pre-service mathematics teachers. 2014 IEEE International Conference on Teaching, Assessment and Learning for Engineering (TALE). doi:10.1109/tale.2014.7062620 
10.1109/tale.2014.7062620