1. A Simple Method for Phase-contrast Microscopy: Improvements in Technique;Baker;Quart. J. micr. Sci.,1949
2. A Culture Chamber for the Microscopical Study of Living Bacteria with Some Observations on the Spore-bearing Aerobes;Harris;J. R. micr. Soc.,1951
3. A Simple Method for Phase-contrast Microscopy;Kempson;Quart. J. micr. Sci.,1948
4. Experiments with a Variable Amplitude and Phase Microscope;Oettlé;J. R. micr. Soc.,1950