1. S. Abrahamson (1961 ) Map showing the hatchery times forAstacus astacusin various parts of Sweden, . In Frst (1961 ).
2. H. Ackefors (1989 ) Intensification of European freshwater crayfish culture in Europe . In: Special session on crayfish culture on aquaculture (World Aquaculture Society, Los Angeles, USA, 13 February 1989).