Geodesic
Linear fractional differential equation with variable coefficients I
Bulletin de l'Académie serbe des sciences. Classe des sciences mathématiques et naturelles, Tome 38 (2013) no. 1 
T. M. Atanacković; B. Stanković. Linear fractional differential equation with  variable coefficients I. Bulletin de l'Académie serbe des sciences. Classe des sciences mathématiques et naturelles, Tome 38 (2013) no. 1. http://geodesic.mathdoc.fr/item/BASS_2013_38_1_a2/
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     title = {Linear fractional differential equation with  variable coefficients {I}},
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     pages = {27 - 42},
     year = {2013},
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Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

We give the existence and the analytic form of the solutions to the linear fractional differential equations in which coefficients are bounded function on $[0,b]$. The method which is used is based on the theory of Volterra's integral equations.