TY  - RPRT
TI  - Methods and reagents. Reducing background colonies with positive selection vectors.
AU  - P N Hengen
PY  - 1997
DO  - 10.1016/s0968-0004(97)01009-8
UR  - https://pubmed.ncbi.nlm.nih.gov/9066262/
ID  - 9066262
ER  -