[1] H. H. Brungs and M. Schröder, Valuation rings in Ore extensions,
J. Algebra 235(2) (2001), 665-680.
DOI: https://doi.org/10.1006/jabr.2000.8484
[2] H. H. Brungs and G. Törner, Extensions of chain Ring, Math. Z.
185 (1984), 93-104.
DOI: https://doi.org/10.1007/BF01214974
[3] H. Marubayashi, H. Miyamoto and A. Ueda, Non-commutative valuation
rings and semi-hereditary orders, K-Monographs in Math.3,
Kluwer Academic Publishers 1997.
DOI: https://doi.org/10.1007/978-94-017-2436-4
[4] O. Ore, Linear equations in non-commutative fields, Ann. of Math.
32(3) (1931), 463-477.
DOI: https://doi.org/10.2307/1968245
[5] G. Xie, Y. Chen, H. Marubayashi and Y. Wang, A new classification
of graded extensions in a skew Laurent polynomial ring, Far East J.
Math. Sci. 40(1) (2010), 37-44.
[6] G. Xie, J. Liang and M. Wang, Quotient skew fields of skew group
rings of torsion free addictive groups over a skew field (to appear in
FJMS).
[7] H. Marubayashi and G. Xie, A classification of graded extensions
in a skew Laurent polynomial ring, J. Math. Soc. Japan 60(2) (2008),
423-443.
DOI: https://doi.org/10.2969/jmsj/06020423
[8] H. Marubayashi and G. Xie, A classification of graded extensions
in a skew Laurent polynomial ring, II, J. Math. Soc. Japan 61(4)
(2009), 1111-1130.
DOI: https://doi.org/10.2969/jmsj/06141111
[9] G. Xie, M. Wang and J. Liang, Graded extensions in (preprint).