1. Strain improvement by nonrecombinant methods;Vinci,1999
2. Improvement of microbial strains and fermentation processes;Parekh;Appl. Microbiol. Biotechnol.,2000
3. Induced quantitative variation for penicillin titre in clonal populations of Aspergillus nidulans;Simpson;J. Gen. Microbiol.,1979
4. Highly efficient mutagenesis of Claviceps purpurea by using protoplasts;Keller;Appl. Environ. Microbiol.,1983
5. Improvement of Streptomyces strains by the regeneration of protoplasts;Kurzatkowski,1986