@article{FCAA_2005_8_1_a4,
     author = {Umarov, Sabir and Gorenflo, Rudolf},
     title = {On {Multi-Dimensional} {Random} {Walk} {Models} {Approximating} {Symmetric} {Space-Fractional} {Diffusion} {Processes}},
     journal = {Fractional calculus and applied analysis},
     pages = {73--88},
     publisher = {mathdoc},
     volume = {8},
     number = {1},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/FCAA_2005_8_1_a4/}
}