Therif, A., and I. Benssassi. “Innovation in the Promotional Mix Elements and Its Impact on ‎the Rapid Spread of New Products An Analytical Study of the Opinions of a Sample of Beneficiaries Display ‎smartphone "Lenovo”. Dirassat Journal Economic Issue, Vol. 6, no. 2, Apr. 2020, pp. 165-92, doi:10.34118/djei.v6i2.392.