REFERENCES
- Bell , H. E. and Nada , I. 1987 . On Some Center-like Subsets of Rings . Arch. Math. , 48 : 381 – 387 .
- Bourbaki , N. 1970 . “ Chapitres 1 à 3 ” . In Algèbre I Paris : Hermann .
- Elliger , S. 1975 . Über Automorphismen und Derivationen von Ringen . J. Reine Angew. Math. , 277 : 155 – 177 .
- Hattori , A. 1970 . On High Order Derivations from the View-point of Two-sided Modules . Sci. Papers College Gen. Ed. Univ. Tokyo , 20 : 1 – 11 .
- Heyneman , R. G. and Sweedler , M. E. 1969 . Affine Hopf Algebras, I . J. Algebra , 13 : 192 – 241 .
- Hongan , M. and Komatsu , H. 2000 . On the Module of Differentials of a Noncommutative Algebras and Symmetric Biderivations of a Semiprime Algebra . Comm. Algebra , 28 ( 2 ) : 669 – 692 .
- Komatsu , H. 2001 . Quasi-separable Extensions of Noncommutative Rings . Comm. Algebra , 29 ( 3 ) : 1011 – 1019 .
- Miyashita , Y. 1966 . Finite Outer Galois Theory of Non-commutative Rings . J. Fac. Sci. Hokkaido Univ. Ser. I , 19 : 114 – 134 .
- Nakai , Y. 1970 . High Order Derivations I . Osaka J. Math. , 7 : 1 – 27 .
- Osborn , H. 1967 . Modules of Differentials . I. Math. Ann. , 170 : 221 – 244 .
- Silver , L. 1967 . Non-commutative Localizations and Applications . J. Algebra , 7 : 44 – 76 .
- Sweedler , M. E. 1975 . Purely Inseparable Algebras . J. Algebra , 35 : 342 – 355 .
- Sweedler , M. E. 1980 . Right Derivations and Right Differential Operators . Pacific J. Math. , 86 : 327 – 360 .