@article{JRAM_1983__344_152558,
     author = {Ilpo Laine and Steven B. Bank},
     title = {Representations of solutions of periodic second order linear differential equations.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {1--21},
     publisher = {mathdoc},
     volume = {344},
     year = {1983},
     zbl = {0524.34007},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1983__344_152558/}
}