Johnson M, Kavitha K, Chalishajar D, Malik M, Vijayakumar V, Shukla A. An analysis of approximate controllability for Hilfer fractional delay differential equations of Sobolev type without uniqueness. NAMC [Internet]. 2023 Apr. 26 [cited 2024 Jul. 18];28(4):632-54. Available from: https://www.journals.vu.lt/nonlinear-analysis/article/view/32118