TY  - DATA
AU  - Berstel, Jean,
TI  - Combinatorics on words: Christoffel words and repetitions in words 
T2  - CRM Monograph Series, 
SN  - 9781470417734 (online)
PY  - 2009///
CY  - Providence, R.I.
PB  - American Mathematical Society
KW  - Combinatorial analysis
KW  - Word problems (Mathematics)
N1  - Includes bibliographical references (p. 135-141) and index
UR  - https://doi.org/10.1090/crmm/027
ER  -