Steven Weinberg. The cosmological constant problem. „Reviews of Modern Physics”. 61 (1), 1989-01-01. DOI: 10.1103/RevModPhys.61.1. (ang.).
Alexander Kamenshchika, Ugo Moschellac, Vincent Pasquier. An alternative to quintessence. „Physics Letters B”. 511 (2–4), s. 265–268, 2001-07-05. DOI: 10.1016/S0370-2693(01)00571-8. (ang.).