@article{10_4064_sm207_2_1,
     author = {Hans-Peter Beise and J\"urgen M\"uller},
     title = {Growth of (frequently) hypercyclic functions
 for differential operators},
     journal = {Studia Mathematica},
     pages = {97--115},
     publisher = {mathdoc},
     volume = {207},
     number = {2},
     year = {2011},
     doi = {10.4064/sm207-2-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm207-2-1/}
}