Morphology vs. Physical Properties: Some Comments and Questions
            
    Some of the correlations between morphological and other physical properties of planetary nebulae (PNe) are reviewed. In particular, the finding that bipolar b PNe have more massive progenitors than the other morphological classes is discussed in detail. Earlier results are confirmed; including all the various sources of uncertainty, the Galactic
            Corradi, Romano L. M.
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                        2000