1. Abeles, F., P. Morgan &M. Saltveit. 1992. Ethylene in plant biology. Ed 2. Academic Press, San Diego.
2. Adams, R. P. &J. E. Adams (eds.). 1991. Conservation of plant genes: DNA banking and in vitro technology. Academic Press, San Diego.
3. Ahmad, I., F. Larher &G. R. Stewart. 1979. Sorbitol, a compatible organic solute inPlantago maritima. New Phytol.82: 671–678.
4. Albrecht-Buehler, G. 1991. Possible mechanisms of indirect gravity sensing by cells. Amer. Soc. Gravitational & Space Biol., ASGSB Bull.4(2): 25–34.
5. —. 1992. The simulation of microgravity conditions on the ground. Amer. Soc. Gravitational & Space Bio., ASGSB Bull.5(2): 3–10.