1. Field Guide to Diffractive Optics
2. Optical Systems with Phase Layers;Slusarev,1957
3. An Objective with a Phase Plate;Tudorovski,1959
4. US Patent 4,846,552 “Method of Fabricating High Efficiency Binary Planar Optical Elements,” assigned to MIT (Jul. 11, 1989).
5. US Patent 5,638,212 “Method of Manufacturing a Diffractive Surface Profile,” assigned to Eastman Kodak (Jun. 10, 1997).