@article{EJDE_2014__2014__a159,
     author = {Ahmad,  Bashir and Ntouyas,  Sotiris K.},
     title = {Initial-value problems for hybrid {Hadamard} fractional differential equations},
     journal = {Electronic journal of differential equations},
     year = {2014},
     volume = {2014},
     zbl = {1300.34012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2014__2014__a159/}
}