Boussalem, Aboubaker, and Yassine Boubaker. “The Effect of Depending The Product Development Technical Methods on Creating New Product A Study on the Mobile Services: The Second Generation GSM and The Third 3G”. Milev Journal of Research and Studies, vol. 3, no. 1, June 2017, pp. 559-78, doi:10.58205/mjrs.v3i1.885.