ON THE FREDHOLM AND UNIQUE SOLVABILITY OF NONLOCAL ELLIPTIC PROBLEMS IN MULTIDIMENSIONAL DOMAINS ArticleGurevich P.L., Skubachevskiĭ A.L.Trudy Moskovskogo Matematicheskogo Obshchestva. 2007.
GLOBAL TOPOLOGICAL DEFECTS IN EXTRA DIMENSIONS AND THE BRANE WORLD CONCEPT ArticleBronnikov Kirill A., Meierovich Boris E., Abdyrakhmanov Sergei T.Gravitation and Cosmology. Vol. 12. 2006. P.. 106-110