@article{MS2_1989__65_2_167074,
     author = {Oryan. M.H.},
     title = {On power series and {Mahler's} {U-numbers.}},
     journal = {Mathematica Scandinavica},
     pages = {143--151},
     publisher = {mathdoc},
     volume = {65},
     number = {2},
     year = {1989},
     zbl = {0706.11034},
     url = {http://geodesic.mathdoc.fr/item/MS2_1989__65_2_167074/}
}