Isham, C. J.; Salam, Abdus; Strathdee, J. (May 15, 1972). "Infinity Suppression in Gravity-Modified Electrodynamics. II". Physical Review D. 5 (10). American Physical Society (APS): 2548–2565. Bibcode:1972PhRvD...5.2548I. doi:10.1103/physrevd.5.2548. ISSN0556-2821.
Isham, C. J.; Salam, Abdus; Strathdee, J. (May 15, 1972). "Infinity Suppression in Gravity-Modified Electrodynamics. II". Physical Review D. 5 (10). American Physical Society (APS): 2548–2565. Bibcode:1972PhRvD...5.2548I. doi:10.1103/physrevd.5.2548. ISSN0556-2821.
Isham, C. J.; Salam, Abdus; Strathdee, J. (May 15, 1972). "Infinity Suppression in Gravity-Modified Electrodynamics. II". Physical Review D. 5 (10). American Physical Society (APS): 2548–2565. Bibcode:1972PhRvD...5.2548I. doi:10.1103/physrevd.5.2548. ISSN0556-2821.