1. The formation and nitrogen-fixing activity of root nodules of Alnus glutinosa under field conditions;Akkermans,1976
2. The cultivation of sea-buckthorn for fruit-processing industry;Albrecht;Gartenbau,1981
3. Experience in growing sea buckthorn;Albrecht;Gartenbau,1984
4. Alder in sulphate pulping;Alestalo;Papperi Puu,1967
5. Die Erles als Vorwald;Altmann;Forstarchiv.,1940