%0 Journal Article %T Flow and transport in highly heterogeneous formations: 1. Conceptual framework and validity of first‐order approximations %A Dagan, G. %A Fiori, A. %A Janković, I. %J Water Resources Research %V 39 %N 9 %P n/a-n/a %@ 0043-1397 %D 2003-09-01 %I Wiley Subscription Services, Inc., A Wiley Company %~ DeepDyve