| Authors(s) | Zwölfer, H. |
| Year | 1961 |
| Title | A comparative Analysis of the Parasite Complexes of the European Fir Budworm, Choristoneura murinana (Hüb.), and the North American Spruce Budworm, C. fumiferana (Clem.). Technical Bulletin of the Commonwealth Institute of Biological Control, 1: 1-162. |