TY  - RPRT
TI  - Approximation algorithms.
AU  - A S Schulz
AU  - D B Shmoys
AU  - D P Williamson
PY  - 1997
DO  - 10.1073/pnas.94.24.12734
UR  - https://pubmed.ncbi.nlm.nih.gov/9370525/
ID  - 9370525
ER  -