1. Burr, B., Nelson, O.: Induction and maintenance of maize callus tissue. - Maize Genet. Coop. Newslett.46: 202–203, 1972.
2. Feung, C. S., Hamilton, R. H., Mumma, R. O.: Metabolism of 2,4-, dichlorophenoxyacetic acid. 10. Identification of metabolites in rice root callus tissue cultures. - J. Agr. Food Chem.24: 1013–1015, 1976.
3. Freeling, M., Woodman, J. C., Cheng, D. S. K.: Developmental potentials of maize tissue cultures.- Maydica21: 97–112, 1976.
4. Green, C. E.: Prospects for crop improvement in the field of cell culture. - HortScience12: 7 to 10, 1977.
5. Green, C. E., Phillips, R. L.: Plant regeneration from tissue cultures of maize. - Crop Sci.15: 417–421, 1975.