1. Adam H, Czihak G (1964) Arbeitsmethoden der makroskopischen und mikroskopischen Anatomie. Gustav Fischer Verlag, Stuttgart
2. Beyer H (1954) Das phasenkontrastverfahren in der Mikroskopie. Urania 17:639–640
3. Bouška V, Kašpar P (1983) Special optical methods (in Czech). Academia, Praha
4. Brocksch D (1994) Phase-contrast, Nomarski (differential interference) contrast and dark-field microscopy: black and color photomicrography. In: Celis JE (ed) Cell Biology, vol 2. Academic Press, San Diego, pp 5–14
5. Canter-Lund H, Lund JWG (1995) Freshwater algae, their microscopic world explored. Biopress Ltd, Bristol