@article{EJDE_2012__2012__a49,
     author = {Yang, Chen and Zhai, Chengbo},
     title = {Uniqueness of positive solutions for a fractional differential equation via a fixed point theorem of a sum operator},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2012},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2012__2012__a49/}
}