[1]Goodearl K R, Handelman D E, Lawrence J W. Affine Representations of Grothendieck Groups and Application to Ricket C-Algebras and @0-Continuous Regular Rings. Mem Amer Math Soc, 1980, 234

[2]Goodearl K R. Von Neumann Regular Rings, Krieger Publishing Company. Malabar, Florida, 1991

[3]Goodearl K R. Metrically complete regular rings. Trans Amer Math Soc, 1982, 272: 275-310

[4]Pardo E. Metric completions of ordered groups and K0 of exchange rings. Trans Amer Math Soc, 1998,350: 913-933

[5]Lu D Ch, Li Q Sh, Tong W T. Comparability, stability and completions of ideals. Comm Algebra, 2004,32: 2617-2634

[6]Mendal P, Moncasi J. On regular rings with stable range 2. J Pure Appl Algebra, 1982, 24: 25-40

[7]Goodearl K R. Directly finite aleph-nought-continuous regular rings. Pacific J Math, 1982,100: 105-122

[8]Wu T S, Tong W T. Finitely generated projective modules over exchange rings. Manuscripta Math,1995,86: 149-157

[9]Chen H Y, Qin H R. Exchange rings and comparable conditions. Acta Math Sci, 2001, 21A: 335-341

[10]O’Meara K C. Simple regular rings satisfying weak comparability. J Algebra, 1991, 141: 162-186

[11]Wu T S. Exchange rings with general aleph-nought-comparability. Comm Algebra, 2001, 29: 815-828

[12]Torrens J. On the N-metric completion of regular rings. Arch Math, 1986, 47:529-534

[13]Burgess W D, Handelman D E. The N-completion of regular rings. Math Ann, 1982, 261:235-254