1. S. L. Adler and R. F. Dashen, “Current Algebras and Applications to Particle Physics”, W. A. Benjamin (1968). This book serves as a general reference for these lectures. It contains numerous useful references and includes reprints of many of the pioneer papers in the field.
2. Y. Nambu and G. Jona-Lasinio, Phys. Rev. 122, 345 (1961)
3. Y. Nambu and G. Jona-Lasinio, Phys. Rev. 124, 246 (1961).
4. D. A. Dicus, R. Jackiw and V. L. Teplitz, Phys. Rev. D4, 1733 (1971).
5. G. Calucci, R. Jengo, G. Furlan and C. Rebbi, Phys. Letters 37B, 416 (1971).