"Engrais azotés Congrès." . . "Conference ;Gießen, April 1991." . . . . . . "Conference papers and proceedings" . "Conference papers and proceedings"@en . . "Conference proceedings" . . . . . "Aufsatzsammlung" . . . "Nitrogen metabolism of plants" . "Nitrogen metabolism of plants"@en . . . . . . . . . . . . . . . . . . . . . "Nitrogen Metabolism of Plants" . . . . . "Nitrogen metabolism in plants"@en . . "Nitrogen metabolism in plants" . . "Kongreß" . . . . . "Nitrogen metabolism of plants : Conference : Papers"@en . . . . . . . . . . "Nitrogen metabolim of plants" . . . . . . . . . "Plantes Métabolisme Congrès." . . "Nitrogen" . . "Plantas Metabolismo del nitrógeno." . . "Congressi - Giessen - 1991." . . "Ammonia" . . "Anatomi Fysiologi Morfologi Biologi" . . "Nitrates" . . . . "Stickstoffstoffwechsel." . . "Stofwisseling." . . "Piante - Metabolismo dell'azoto - Congressi - 1991." . . "Azote Métabolisme Congrès." . . "Plants" . . "Pflanzen Stickstoffstoffwechsel Kongressbericht." . . "Metabolisme" . . "Pflanzen." . . "Plant nutrition" . . "Planten." . . "Plants Metabolism." . . "Azote en agriculture Congrès." . . "Physiology" . . "Nitrogen Metabolisme." . . "Aufsatzsammlung." . . "Nitrogen Metabolism." . . "Nitrogen metabolism" . "Plantes Metabolisme." . . "Plantes Métabolisme." . "Kongress." . . "Plantes" . . "Stickstoffstoffwechsel Pflanzen Kongressbericht." . . "Plants Metabolism Congresses." . . "Nitrogen Metabolism Congresses." . . "Root nodulation" . . "Stikstof." . .