A search for clusters at high redshift - III. Candidate Hα emitters and EROs in the PKS 1138–262 proto-cluster at z = 2.16J. D. Kurk, L. Pentericci, H. J. A. Röttgering and G. K. MileyA&A, 428 3 (2004) 793-815DOI: https://doi.org/10.1051/0004-6361:20040075