Theoretical models of planetary nebulae

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[13]  J. Kaler A catalog of relative emission line intensities observed in planetary and diffuse nebulae , 1976 .

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[23]  J. Kaler Excitation of Nebular Spectrum Lines , 1972 .

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[32]  D. Flower The ionization structure of planetary nebulae-VII. The heavy elements , 1969 .

[33]  J. P. Harrington Ionization stratification and chemical abundances in the planetary nebula NGC 7662. , 1969 .

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[37]  G. Münch Internal Motions in the Planetary Nebula NGC 6543 , 1968 .

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[43]  W. Green A study of certain nebulae , 1916 .