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Recent work has shown t h a t t h e f i n g e r i n g i n s t a-b i l i t y , which develops when a more v i s c o u s f l u i d i s pushed through the voids of a porous medium o r through a Hele-Shaw c e l l by a less v i s c o u s f l u i d , can be prevented i f a m a g n e t i c f i e l d i s applied tang e n t i a l t o a f l a t f l u i d i n t e r f(More)
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