TY - RPRT TI - Direct-space methods in phase extension and phase determination. III. Phase refinement using Sayre's equation. AU - L S Refaat AU - M M Woolfson PY - 1995 DO - 10.1107/s0907444995006469 UR - https://pubmed.ncbi.nlm.nih.gov/15299772/ ID - 15299772 ER -