YUJI LIU; SHIMIN LI. Periodic boundary value problems for singular fractional differential equations with impulse effects. Malaya Journal of Matematik, India, v. 3, n. 04, p. 423–490, 2015. DOI: 10.26637/mjm304/006. Disponível em: https://www.malayajournal.org/index.php/mjm/article/view/491. Acesso em: 16 jul. 2024.