1Jessica Taylor Bond. Innovations in Extrusion [ J]. Pedfood Industry, 2007,12:32 -34.
2Wenger Manufacturing Inc. Method and Apparatus for the Simultaneous Production of Differently Characterized Extrudates [ P ]. USA : US Patent No. 6719448,2004.
3Dick Ziggers. Seducing Pet Owners with Shapes and Colors [ J]. Feed Tech, 2007,11 (2) : 41-43.