1. Arditti J, and Ernst R. (1993). <italic>Micropropagation of orchids</italic> <bold></bold>. John Wiley & Sons, New York.
2. Changes in phenol content during strawberry (Fragaria
×ananassa,
cv. Chandler) callus culture
3. Influence of Polyamines on Growth of Hairy Root Cultures of Witloof Chicory (Cichorium intybus L. cv. Lucknow Local) and Formation of Coumarins
4. Bais HP, Sudha GS, Suresh B, and Ravishankar GA. (2000a) AgNO<sub>3</sub> influences <italic>in vitro</italic> root formation in <italic>Decalepis hamiltonii</italic> Wight and Arn. <italic>Current Science</italic> <bold>79</bold>, 894-898.
5. Bais HP, Sudha GS, and Ravishankar GA. (2000b) Putrescine and AgNO<sub>3</sub>influences shoot multiplication <italic>In vitro</italic> flowering and endogenous titers of polyamines in <italic>Chichorium intybus</italic> L. cv. Lucknow Local. <italic>J Plant Growth Regul</italic> <bold>19</bold>, 238-248.