Description  Claims  Cited references 

US5981500A   [0005] 
EP677054A   [0005] 
WO94015944A   [0005] 
CN94101917   [0005] 
US6906184B   [0005]  [0014]  [0028] 
EP1003764A   [0005] 
WO99007721A   [0005] 
CN98808106   [0005] 
WO2010065852A   [0005] 

Master's Thesis of Northeast Agricultural University   [0005]