The exotic eclipsing nucleus of the ring planetary nebula SuWt 2 K. Exter, H.E. Bond, K.G. Stassun, B. Smalley, P.F.L. Maxted and D.L. Pollacco EAS Publications Series, 64 (2013) 361-362 Published online: 25 February 2014 DOI: 10.1051/eas/1364050