Shaisha, Mohamed Abu and Hebat-Allah M. Mourad. "Sharable WDM/TDM Unidirectional Optical Ring Network" Frequenz, 56.7-8 (2002): 150-156. Retrieved 23 May. 2013, from doi:10.1515/FREQ.2002.56.7-8.150

Shaisha, M. & Mourad, H. (2002). Sharable WDM/TDM Unidirectional Optical Ring Network. Frequenz, 56(7-8), pp. 145-184. Retrieved 23 May. 2013, from doi:10.1515/FREQ.2002.56.7-8.150

Shaisha, Mohamed Abu and Hebat-Allah M. Mourad. 2002. Sharable WDM/TDM Unidirectional Optical Ring Network. Frequenz. 56(7-8): 145-184. Retrieved 23 May. 2013, from doi:10.1515/FREQ.2002.56.7-8.150