Hafezi, M., Vhabzadh, F., Nasrnzhad, B., Mofareh, A., Fallah, N. (2005). 'Tyaflavyn changes in the pattern of Iranian black tea - the traditional methods of assessment and CTC tea leaves in Pychshdhy', Sharif Journal of Industrial Engineering & Management, Vol.21(No. 32), pp. 49-56.