Hutchings (1972)
The non-spherical nebulae of nova Delphini 1967, nova Vulpeculae 1968(I), and nova Serpentis 1970
http://ads.nao.ac.jp/abs/1972MNRAS.158..177H
Malakpur (1973)
Nebular stage of nova Delphini 1967, I
http://ads.nao.ac.jp/abs/1973A%26A....24..125M
Soderblom (1976)
Resolution of the structure of nova (HR Delphini) 1967
http://ads.nao.ac.jp/abs/1976PASP...88..517S
The non-spherical nebulae of nova Delphini 1967, nova Vulpeculae 1968(I), and nova Serpentis 1970
http://ads.nao.ac.jp/abs/1972MNRAS.158..177H
Malakpur (1973)
Nebular stage of nova Delphini 1967, I
http://ads.nao.ac.jp/abs/1973A%26A....24..125M
Soderblom (1976)
Resolution of the structure of nova (HR Delphini) 1967
http://ads.nao.ac.jp/abs/1976PASP...88..517S
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