NICHOLAS, D J D Use of Aspergillus niger as a test organism for determining molybdenum available in soils to crop plants. [electronic resource] - Nature Aug 1950 - 342-3 p. digital Publication Type: Journal Article ISSN: 0028-0836 Standard No.: 10.1038/166342a0 doi Subjects--Topical Terms: AspergillusAspergillus nigerMolybdenumSoil