1. Gates, S.J. Jr., Grisaru, M.T., Rocek, M., Siegel, W.: Front. Phys. 58, 1 (1983). hep-th/0108200
2. Zwiebach, B.: A First Course in String Theory. Cambridge University Press, Cambridge (2004)
3. Green, M.B., Schwarz, J.H., Witten, E.: Superstring Theory. Cambridge University Press, Cambridge (1987)
4. Polchinski, J.: String Theory. Cambridge University Press, Cambridge (1998)
5. Bjorken, J.D., Drell, S.D.: Relativistic Quantum Mechanics. McGraw-Hill, New York (1964)