@article{10_4064_cm104_2_2,
     author = {Petter Andreas Bergh},
     title = {Complexity and periodicity},
     journal = {Colloquium Mathematicum},
     pages = {169--191},
     publisher = {mathdoc},
     volume = {104},
     number = {2},
     year = {2006},
     doi = {10.4064/cm104-2-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm104-2-2/}
}