Structural, physical, theoretical and spectroscopic investigations of mixed-valent Eu2Ni8Si3 and its structural anti-type Sr2Pt3Al8 - Stegemann, Frank; Block, Theresa; Klenner, Steffen; Zhang, Yuemei; Fokwa, Boniface P. T.; Doerenkamp, Carsten; Eckert, Hellmut; Janka, Oliver (European Journal of Inorganic Chemistry, 2021)