Fractional investigations of zoonotic visceral leishmaniasis disease with singular and non-singular kernelMuhammad Altaf Khan, Olusola Kolebaje, Ahmet Yildirim, Saif Ullah, P. Kumam and P. ThounthongEur. Phys. J. Plus, 134 10 (2019) 481DOI: https://doi.org/10.1140/epjp/i2019-12861-1