1. Handbook of mathematical functions;Abramowitz,1971
2. Influence of nutrient deficiency and light on turion formation in Spirodela polyrrbiza (L.) Schleiden;Appenroth;Biochem. Physiol. Pflanzen,1989
3. Photophysiology of turion germination in Spirodela polyrrbiza (L.) Schleiden;Augsten;I. Phytochrome-mediated responses of light- and dark-grown turions. J. Plant Physiol,1988
4. Curve fitting of germination data using the Richards function;Berry;Plant Cell Environ,1988
5. Physiology and Biochemistry of Seeds in Relation to Germination Vol. 2;Bewly,1982