Electronic States Density, Resistivity, and Phase Composition of CaTiO3 Perovskite with Isomorphic Impurity of Niobium - O. M. Ponomarenko; L. M. Stepanyuk; A. S. Smolyar; A. O. Burkhan; O. M. Bloshchanevich; A. I. Stegniy; V. L. Bekenev; A. V. Stepanenko; V. G. Khomenko; M. P. Brodnikovskyy; B. S. Khomenko (Mineralogical journal, 2023)