Dawson, P. A. (1972). Observations on the structure of some forms of Gomphonema parvulum Kütz. I. Morphology based on light microscopy, and transmission and scanning electron microscopy. British Phycological Journal. 7(2): 255-271.
Observations on the structure of some forms of Gomphonema parvulum K�tz. I. Morphology based on light microscopy, and transmission and scanning electron microscopy
