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Brightwell, Graham, Henson, Joe and Surya, Sumati (2008) A 2D model of causal set quantum gravity: the emergence of the continuum. Classical and Quantum Gravity, 25 (10). p. 105025. ISSN 0264-9381
Brightwell, Graham R., Dowker, Fay, GarciĆ”, Raquel S., Henson, Joe and Sorkin, Rafael D. (2003) "Observables" in causal set cosmology. Physical Review D, 67 (8). Art. no. 084031. ISSN 1550-7998