Observational constraints on general relativistic energy conditions, cosmic matter density and dark energy from X-ray clusters of galaxies and type-Ia supernovaeP. Schuecker, R. R. Caldwell, H. Böhringer, C. A. Collins, L. Guzzo and N. N. WeinbergA&A, 402 1 (2003) 53-63DOI: https://doi.org/10.1051/0004-6361:20030197
