1. The sources of contrast in different types of transmitted-light polarizing interference microscopes: I. Theoretical considerations about image-duplication and differential instruments;Allen;Proc. R. microsc. Soc.,1966
2. The Zeiss-Nomarski differential interference equipment for transmitted-light microscopy;Allen;Z. wiss. Mikrosk.,1969
3. The sources of contrast in different types of transmitted-light polarizing interference microscopes: II. The image of standard objects examined under the image-duplication and differential interference microscopes;David;Proc. R. microsc. Soc.,1966
4. Amplitude-contrast microscopy in histochemistry;David;Histochemie,1971
5. Quantitative cytochemical observations of the control of respiration in polymorphonuclear neutrophil leucocytes of Amphiuma tridactylum;David;J. Cell Sci.,1972