Cationic cluster formation versus disproportionation of low-valent indium and gallium complexes of 2,2'-bipyridine. - Lichtenthaler, Martin R.; Stahl, Florian; Kratzert, Daniel; Heidinger, Lorenz; Schleicher, Erik; Hamann, Julian; Himmel, Daniel; Weber, Stefan; Krossing, Ingo (Scientific Reports, 2015)