1. Density-dependence in the breeding success of the Pied Flycatcher Ficedula hypoleuca;Alatalo;J. Anim. Ecol.,1984
2. A comparative study of the breeding ecology of the Great Tit Parus major in different habitats;Balen;Ardea,1973
3. The relationship between nestbox size, occupation and breeding parameters of the Great Tit Parus major and some other hole nesting species;Balen;Ardea,1984
4. Studies on hole-nesting birds in natural nest sites;Balen;1. Availability and occupation of natural nest sites. Ardea,1982