Gerhard, O., Arnaboldi, M., Freeman, K. C., Okamura, S., Kashikawa, N., & Yasuda, N. (2007). The kinematics of intracluster planetary nebulae and the on-going subcluster merger in the Coma cluster core. Extended baselines for the IRAM Plateau de Bure interferometer: first results, 815-822. doi:10.1051/0004-6361:20066484.