@article{PIM_1990_N_S_47_61_a7,
     author = {M. K. Aouf},
     title = {Linear {Combinations} of {Regular} {Functions} of {Order} {Alpha} with {Negative} {Coefficients}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {61 },
     publisher = {mathdoc},
     volume = {_N_S_47},
     number = {61},
     year = {1990},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1990_N_S_47_61_a7/}
}