Aghanim, N., Bartelmann, M., & Schäfer, B. M. (2011). Planck early results: IX. XMM-Newton follow-up for validation of Planck cluster candidates. Arxiv.
Chicago Style (17th ed.) CitationAghanim, Nabila, Matthias Bartelmann, and Björn Malte Schäfer. "Planck Early Results: IX. XMM-Newton Follow-up for Validation of Planck Cluster Candidates." Arxiv 2011.
MLA (9th ed.) CitationAghanim, Nabila, et al. "Planck Early Results: IX. XMM-Newton Follow-up for Validation of Planck Cluster Candidates." Arxiv, 2011.
Warning: These citations may not always be 100% accurate.