@article{FCAA_2006_9_1_a4,
     author = {Umarov, Sabir and Saydamatov, Erkin},
     title = {A {Fractional} {Analog} of the {Duhamel} {Principle}},
     journal = {Fractional calculus and applied analysis},
     pages = {57--70},
     year = {2006},
     volume = {9},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/FCAA_2006_9_1_a4/}
}