@article{NSJOM_2012_42_1a_12,
     author = {Benharrat Bela\"{i}di},
     title = {On the $[p,q]$-order of analytic solutions of linear differential
 equations in the unit disc},
     journal = {Novi Sad Journal of Mathematics},
     pages = {117-129},
     publisher = {mathdoc},
     volume = {42},
     number = {1},
     year = {2012},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_2012_42_1a_12/}
}