TY - JOUR T1 - Analysis of topological information from defocused speckle photographs JO - Optics & Laser Technology PY - 1977/02/01 AU - Gregory DA ED - DO - DOI: 10.1016/0030-3992(77)90042-1 PB - Elsevier VL - 9 IS - 1 SP - 6 EP - 12 Y2 - 2026/03/14 ER -