Cover: FIG. 7(b). HRSEM image of white K-doped Fe–Al–O fibers prepared from acetylacetonates solution taken at a magnification of x50000. [V. Halperin, G.E. Shter, V. Beilin, G.S. Grader: Mesoporous K/Fe–Al–O Nanofibers by Electrospinning of Solution Precursors. p. 3142].