OCHEM, P. (2007, January 1). Letter frequency in infinite repetition-free words. 380(3). Amsterdam: Elsevier, 2007. Retrieved from http://pascal-francis.inist.fr/vibad ndex.php?action=search&terms=18831180
ISO-690 (author-date, English)OCHEM, Pascal, 2007. Letter frequency in infinite repetition-free words. In: [online]. Amsterdam: Elsevier, 2007. 1 January 2007. Available from: http://pascal-francis.inist.fr/vibad ndex.php?action=search&terms=18831180
Modern Language Association 9th editionOCHEM, P. Letter frequency in infinite repetition-free words. no. 3, Amsterdam: Elsevier, 2007., 2007, http://pascal-francis.inist.fr/vibad ndex.php?action=search&terms=18831180.
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OCHEM, P. (2007), “Letter frequency in infinite repetition-free words”, in , Vol. 380, Amsterdam: Elsevier, 2007., available at: http://pascal-francis.inist.fr/vibad ndex.php?action=search&terms=18831180.