1. Narula Alka, Kumar Sanjeev, Bansal KC & Srivastava PS, In Plant biotechnology and molecular markers (PS Srivastava, Alka Narula, Sheela Srivastava, Editors), Kluwer Academic Publ, Dordrecht (2004) p 78.
2. Srivastava PS & Pande D, In Plant tissue culture and molecular biology, applications and prospects (PS Srivastava, Editor), Narosa Publishing House, New Delhi (1998) p 254.
3. Schaller H, Grausem B, Benveniste P, Chye ML, Tan CT, & Song YH, Plant Physical, 109 (1995) 761.
4. Cavalcante-Argôlo AC, Chaarlwood BV & Pletsch M, Planta Med, 66 (2000) 448.
5. Walden R, Cordevio A & Tiburcio AF, Plant Physiol, 113 (1997) 1009.