TY - JOUR AU - M. de Kool BT - The Astrophysical Journal DA - Jan-08-1990 DO - 10.1086/168974 PY - 1990 EP - 189 T2 - The Astrophysical Journal TI - Common envelope evolution and double cores of planetary nebulae UR - http://adsabs.harvard.edu/full/1990ApJ...358..189D VL - 358 SN - 0004-637X ER -