1. Graded subrings ofCXY;Gurjar;Proc. Indian Acad. Sci. Math. Sci.,1989
2. M. Miyanishi, Normal affine subalgebras of a polynomial ring, Algebraic and Topological Theories—To the Memory of Dr. Takehiko Miyata, Kinokuniya, Tokyo, 1985, 37, 51
3. Vector fields on factorial schemes;Miyanishi;J. Algebra,1995
4. On the fourteenth problem of Hilbert;Nagata,1965