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Schüßler, Arthur and Mollenhauer, D. and Schnepf, E. and Kluge, M. (1994): Geosiphon pyriforme, an endosymbiotic association of fungus and cyanobacteria:the spore structure resembles that of arbuscular mycorrhizal (AM) fungi. In: Botanica Acta, Vol. 107, No. 1: pp. 36-45

Schüßler, Arthur and Schnepf, E. (1992): Photosynthesis dependent acidification of perialgal vacuoles in theParamedum bursaria/Chlorella symbiosis. Visualization by monensin. In: Protoplasma, Vol. 166, No. 3-4: pp. 218-222