1. Bradford, M.M., 1976, A rapid and sensitive method for the quantification of microgram quantities of protein utilizing the principle of protein-dye binding, Anal. Biochem., 27:246.
2. Brugada, D., 1966, Sulfur metabolism and detoxifying role of phototrophic bacteria of Vilar lake CBanyoles), Master Science Thesis, Autonomous University of Barcelona, Girona, Spain.
3. Bührer, H., and Ambühl, H., 1975, Einleitung von Abwasser in Seen. Schweiz. Z. Hydrol., 37:347.
4. Clark, A.E., and Walsby, A.E., 1976a, The occurrence of gas-vacuolate bacteria in lakes, Arch. Microbiol., 116:223.
5. Clark, A.E., and Walsby, A.E., 1978b, The development and vertical distribution of populations of gas-vacuolate bacteria in a eutrophic, monomictic lake, Arch. Microbiol. 16:229.