N K · N.P. · Niels P. Kristensen · P.K.
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Primitive Ghost Moths: Morphology and taxonomy of the Australian genus Fraus Walker | 978-0-643-04999-4 (0-643-04999-1) | 1989 | E.S. Nielsen |
| The Sesiidae of Fennoscandia and Denmark | 978-87-87491-02-0 (87-87491-02-8) | 1974 | M. Fibiger |