TY  - RPRT
TI  - A knotty problem.
AU  - M R England
AU  - M C Murphy
PY  - 1997
DO  - 10.1016/s1053-0770(97)90041-0
UR  - https://pubmed.ncbi.nlm.nih.gov/9263107/
ID  - 9263107
ER  -