Set theory
Chechulin V. L., Theory of sets with self-considering (foundations and some applications), Publishing by Perm State University (Russia), Perm, 2010, 100 p.  (In this non-predicative theory overcoming the limitations of  predicative formal systems, i.e. Godel's theorems, the text is accessible from the page http://elibrary.ru/item.asp?id=15267103 )