1. Bobek, B., 1971: Influence of population density upo rodent production in a deciduous forest. Ann. Zool. Fennici8, 137–144.
2. Bruce, H., 1959: An exteroceptive block to pregnancy in the mouse. Nature184, 105.
3. Bruce, H. undParrott, D., 1960: Role of olfactory sense in pregnancy block by strange males. Science131, 1526.
4. Chitty, D., 1952: Mortality among voles (Microtus abrestis L.) at Lake Vyrnwy, Montgomershire in 1936–9. Philos. Transactions Roy. Soc. London236, 505–552.
5. Chitty, D., 1955: Allgemeine Gedankengänge über die Schwankungen bei der Erdmaus (Microtus agrestis). Zschr. Säugetierkde,20, 55–60.