TY - RPRT TI - Phase-derivative imaging. I: Methods and stabilization analysis. AU - R L Romijn AU - B J Oosterveld AU - J M Thijssen PY - 1987 DO - 10.1177/016173468700900301 UR - https://pubmed.ncbi.nlm.nih.gov/3445400/ ID - 3445400 ER -