1. R. Hagedorn, Riv. Nuovo Cimento 6(10), 1 (1983).
2. J. D. Manjavidze, Fiz. Élem. Chastits At. Yadra 16, 101 (1985) [Sov. J. Part. Nucl. 16, 44 (1985)]; J. Manjavidze and A. Sissakian, Preprint No. E2-2000-217, JINR (Joint Inst. Nucl. Res., Dubna, 2000); Phys. Rep. 346, 1 (2001).
3. J. D. Bjorken, Phys. Rev. D 27, 140 (1983).
4. I. L. Rosental and Yu. A. Tarasov, Usp. Fiz. Nauk 163(7), 29 (1993) [Phys. Usp. 36, 572 (1993)].
5. E. L. Feinberg et al., Usp. Fiz. Nauk 104, 539 (1971) [Sov. Phys. Usp. 14 (4), 455 (1971)].