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Publisher
- verlag dr. koster, berlin143
- nakladni zavod globus126
- verlag dr. koster122
- bayerische landesanstalt fur landwirtschaft83
- forschungsinstitut fur biologischen landbau (fibl)77
- canadian science publishing64
- wageningen academic publishers63
- newcastle university and research institute of organic agriculture (fibl)56
- stiftung okologie & landbau, bad durkheim36