TY  - RPRT
TI  - Trace maps associated with general two-letter substitution rules.
AU  - M Kolá
AU  - MK Ali
PY  - 1990
DO  - 10.1103/physreva.42.7112
UR  - https://pubmed.ncbi.nlm.nih.gov/9904026/
ID  - 9904026
ER  -