Spectrophotometric studies of gaseous nebulae. I. The double-ring planetary NGC 7009
| Image |  |
|---|---|
| Description | scholarly article |
| Author/s | |
| Publication date | May 1964 |
| Language | English |
| Country of origin | |
| Wikipedia link | |
| Access work | |
| Copyright status | |
| Missing/wrong data? | Edit Wikidata item |