Koba, Z.; Nielsen, H.B. (1969). "Reaction amplitude for n-mesons a generalization of the Veneziano-Bardakçi-Ruegg-Virasoro model". Nuclear Physics B. 10 (4). Elsevier BV: 633–655. doi:10.1016/0550-3213(69)90331-9. ISSN0550-3213.
Fubini, S.; Veneziano, G. (1969). "Level structure of dual-resonance models". Il Nuovo Cimento A. 64 (4). Springer Science and Business Media LLC: 811–840. doi:10.1007/bf02758835. ISSN0369-3546. S2CID119009821.
Fubini, S.; Veneziano, G. (1969). "Level structure of dual-resonance models". Il Nuovo Cimento A. 64 (4). Springer Science and Business Media LLC: 811–840. doi:10.1007/bf02758835. ISSN0369-3546. S2CID119009821.
Koba, Z.; Nielsen, H.B. (1969). "Reaction amplitude for n-mesons a generalization of the Veneziano-Bardakçi-Ruegg-Virasoro model". Nuclear Physics B. 10 (4). Elsevier BV: 633–655. doi:10.1016/0550-3213(69)90331-9. ISSN0550-3213.
Fubini, S.; Veneziano, G. (1969). "Level structure of dual-resonance models". Il Nuovo Cimento A. 64 (4). Springer Science and Business Media LLC: 811–840. doi:10.1007/bf02758835. ISSN0369-3546. S2CID119009821.