Home News Press Releases The role of Sodium for the Enhancement of Solar Cells Publications of Frank Gehrmann All genres Journal Article (1) Journal Article (1) 1. Journal Article Grabke, H.-J.; Gehrmann, F.; Riecke, E.: Hydrogen in microalloyed steels. Steel Research 72 (5-6), pp. 225 - 235 (2001) MPG.PuRe