1. Ball EA, Morris DM, Rydelius JA (1978) Belgiques pp 181?228.
2. Bhatnagar SP, Sawhney V (1981) Int Rev Cytol 73:55?102.
3. Bradley GL (1982) Giemsa-band karyotyping and the cytogenetics and evolution of Fragaria species, PhD Diss University of California, Davis.
4. Cheema GS, Mehra PN (1982) Morphogenesis in endosperm cultures. Proc 5th Intl Cong Plant Tissue and Cell Culture, Tokyo, Japan.
5. Driver JA, Kuniyuki AH (1984) HortScience 19:507?509.