For Scandinavian bats there is an interesting source of information about this subject:
BAAGOE, H. J. (1987). The Scandinavian bat fauna: adaptive wing morphology and free flight in the field, pp. 57-74 (in): Fenton, M. B. et al. (eds.), Recent advances in the study of bats. Cambridge University Press. Cambridge / London / New York / New Rochelle / Melbourne / Sydney.