//-->
Pregnancy, social status and health in Sweden
Carr-Hill, R. A., (1983)
On the potential of norm-governed behavior in different categories of artificial societies
Davidsson, P., (2006)
Om grundvattenytans variation i Finland under åren 1961-1963 - On variations in the ground water level in Finland during the Years 1961 to 1963
Johansson, S., (1965)