The kinematics of the most oxygen-poor planetary nebula PN G 135.9+55.9M. G. Richer, J. A. López, W. Steffen, G. H. Tovmassian, G. Stasińska and J. EchevarríaA&A, 410 3 (2003) 911-916DOI: https://doi.org/10.1051/0004-6361:20031267
