@article{10_4153_CJM_2006_030_x,
     author = {Chiang, Yik-Man and Ismail, Mourad E. H.},
     title = {On {Value} {Distribution} {Theory} of {Second} {Order} {Periodic} {ODEs,} {Special} {Functions} and {Orthogonal} {Polynomials}},
     journal = {Canadian journal of mathematics},
     pages = {726--767},
     year = {2006},
     volume = {58},
     number = {4},
     doi = {10.4153/CJM-2006-030-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2006-030-x/}
}