1. T. Maniatis, E. F. Fritsch, and J. Sambrook, “Molecular Cloning: A Laboratory Manual,” Cold Spring Harbor Laboratory Press, Cold 37 Spring Harbor, New York, 1982.
2. C. R. Vazquez de Aldana, J. Correa, P. S. Segundo, A. Bueno, A. R. Nebreda, E. Mendez, and F. del Rey,Gene,97, 173–182 (1991).
3. Y. Nogi, in “Superbugs,” ed. by K. Horikoshi and W. D. Grant, Springer-Verlag, Berlin, 1991.