You seem to be attempting to access an item that has been removed from the repository.
There is a later version of the item you are trying to access:
Larsen, Cand.scient Thomas; Ravn, Senior scientist Helle and Axelsen, Senior Scientist Jørgen
Simplified and rapid method for extraction of ergosterol from natural samples and detection with quantitative and semi-quantitative methods using thin-layer chromatography.
Journal of Chromatography A, 1026, 301 - 304.