1. Andrewartha HG, Birch LC (1954) The distribution and abundance of animals. University of Chicago Press, Chicago
2. Andrewartha HG, Birch LC (1984) The ecological web, University of Chicago Press. Chicago London
3. Baars MA (1979) Catches in pitfall traps in relation with mean densities of carabid beetles. Oecologia 41:25–46
4. Berryman AA (1991) Stabilization or regulation: what it all means! Oecologia 86:140–143
5. Croin Michielsen N, Van der Meijden E, Otten JJM (1974) Vogelpopulaties, Centraal Nestkast Onderzoek, Vogelringstation. Meijendel Meded 3:1–88