AIT-MAHIOUT, Karima, DJEBALI, Smail and MOUSSAOUI, Toufik. Multiple solutions for an impulsive boundary value problems on the halfline via Morse theory. Topological Methods in Nonlinear Analysis. Online. 1 March 2016. Vol. 47, no. 1, pp. 219 - 240. [Accessed 27 April 2024]. DOI 10.12775/TMNA.2016.003.