J.A. Nanware, B.D. Dawkar. Method of lower - upper solutions of fractional differential equations with initial time difference and applications. Malaya J. Mat. [Internet]. 2020 Jul. 1 [cited 2024 Jul. 16];8(03):1196-9. Available from: https://www.malayajournal.org/index.php/mjm/article/view/1585