REFERENCES
- Alajbegovic , J. ( 1984 ). Approximation theorems for manis valuations with the inverse property . Comm. Algebra 12 : 1399 – 1417 .
- Atiyah , M. F. , Macdonald , I. G. ( 1969 ). Introduction to Commutative Algebra . Massachusetts : Addison-Wesley .
- Gräter , J. ( 1981 ). Der approximationssatz für manisbewertungen . Arch. Math. 37 : 335 – 340 .
- Green , B. W. ( 1989 ). Immediate extensions of valuation rings . Arch. Math. 53 : 146 – 150 .
- Huckaba , J. A. ( 1988 ). Commutative Rings with Zero Divisors . New York : Marcel Dekker, Inc.
- Knebusch , M. , Zhang , D. ( 2002 ). Manis Valuations and Prüfer Extensions I . A new chapter in commutative algebra. Lecture Notes in Math. 1791 . Berlin : Springer-Verlag .
- Lam , T. Y. ( 1980 ). The Theory of Ordered Fields . Lecture Notes in Pure and Appl. Math. 55 . New York : Marcel Dekker Inc.
- Lam , T. Y. ( 1983 ). Orderings, Valuations, and Quadratic Forms . CBMS Regional Conference Series in Math. 52. Amer. Math. Soc.
- Lam , T. Y. ( 1984 ). An introduction to real algebras . Rocky Mountain J. Math. 14 : 767 – 814 .
- Lu , C. P. ( 1995 ). Spectra of modules . Comm. Algebra 23 : 3741 – 3752 .
- Manis , M. ( 1969 ). Valuations on a commutative ring . Proc. Amer. Math. Soc. 20 : 193 – 198 .
- Marshall , M. ( 1991 ). Orderings and real places on a commutative ring . J. Algebra 140 : 484 – 501 .
- Prestel , A. ( 1984 ). Lecture on Formally Real Fields . Lecture Notes in Math. 1093 . Berlin-New York : Springer-Verlag .
- Velente , K. J. ( 1989 ). On orderings, valuations, and O-primes of a commutative ring . Rocky Mountain J. Math. 19 : 973 – 984 .
- Zeng , G. ( 1999 ). On formally real modules . Comm. Algebra 27 : 5847 – 5856 .
- Zeng , G. ( 2007 ). Valuations on a module . Commun. Algebra 35 : 2341 – 2356 .
- Communicated by A. Prestel.