The Kinematics and Morphology of PNe with close binary nuclei
  We have obtained images and long-slit, spatially resolved echelle spectra for twenty four planetary nebulae (PNe) that have confirmed close binary nuclei. The sample shows a variety of morphologies, however toroids or dense equatorial density enhancements are identified, both in the imagery and the spectra, as the common structural component. These toroids are thought to be the remnant fingerprints of the post common envelope phase. Based on the characteristics of the present sample we suggest a list of additional PNe that are likely to host close binary nuclei 
J. A. L\'opez, Ma. T. Garc\'ia D\'iaz, M. G. Richer, M. Lloyd, J.   Meaburn
astro-ph.GA