TY  - RPRT
TI  - Direct-space methods in phase extension and phase refinement. VI. PERP (phase extension and refinement program).
AU  - L S Refaat
AU  - C Tate
AU  - M M Woolfson
PY  - 1996
DO  - 10.1107/s0907444996008463
UR  - https://pubmed.ncbi.nlm.nih.gov/15299572/
ID  - 15299572
ER  -