1. The Zeiss-Nomarski differential equipment for transmitted light microscopy;Allen;Z. Wissenschaft. Mikro.,1969
2. The isolation of subcellular components;Allfrey,1959
3. The Nomarski interference-contrast microscope. An experimental basis for image interpretation;Padawer;J. Roy. Microsc. Soc.,1968
4. 2. Churchill Livingstone, London, 1972.