Guerch, A., and A. Achi. “Measuring the Impact of Customer Expectations On the ‎experience of Their Relationship in the Field of Customer Service ‎Subscribers to Third-Generation (3G++) -Case Study of Mobilis‏ ‏operator’s Customers”. Dirassat Journal Economic Issue, Vol. 7, no. 1, Jan. 2016, pp. 127-65, doi:10.34118/djei.v7i1.280.