Nat Methods. 2006 Jul;3(7):561-70 doi:10.1038/nmeth897

Miller OJ, Bernath K, Agresti JJ, Amitai G, Kelly BT, Mastrobattista E, Taly V, Magdassi S, Tawfik DS, Griffiths AD.

Directed evolution by in vitro compartmentalization.

Method for water in oil in water emulsion (w/o/w).