The nature of SrLn2BIVBIIIO7 (Ln = La—Sm, BIV = Ti, Sn, BIII = Sc, In) with slab perovskitelike structure - Yu. O. Titov; M. S. Slobodianyk; V. V. Chumak; M. V. Tymoshenko (Reports of the National Academy of Sciences of Ukraine, 2020)