@article {IOPORT.05747163,
    author       = {Currie, James D. and Saari, Kalle},
    title        = {Least periods of factors of infinite words.},
    year         = {2009},
    journal      = {Revista de Inform\'atica Te\'orica e Aplicada},
    volume       = {43},
    number       = {1},
    pages        = {165-178},
    publisher    = {Universidade Federal do Rio Grande do Sul},
    doi          = {10.1051/ita:2008006},
    identifier   = {05747163},
}