%0 conference lecture %@ %A Michaelsen, C.,Wiesmann, J.,Bormann, R.,Nowak, C.,Dicker, C.,Hollensteiner, S.,Jaeger, W. %D 2001 %J SPIEĀ“S - 46th Annual Meeting %N %P %T La / B4C Multilayer mirrors for X-rays below 190eV %U %X