[1] Michael F Küchel. A new approach to solve the three flat problem [J]. Optik(S0030-4026)，2001，9：381-391.

[3] Ulf Griesmann. Three-flat test solutions based on simple mirror symmetry [J]. Appl.Opt(S2155-3165)，2006，45(23)：5856-5865.

[4] Günter Schulz. Absolute flatness testing by an extended rotation method using two angles of rotation [J].Appl.Opt(S2155-3165)，1993，32(7)：1055-1059.

[5] Gunter Schulz，Jürgen Grzanna. Absolute flatness testing by the rotation method with optimal measuring-error compensation [J].Appl.Opt(S2155-3165)，1992，31(19)：3767-3780.

[6] Ulf Griesmann，Quandou Wang，Johannes Soons，et al. A simple ball average for reference sphere calibrations [J]. Proc. of SPIE(S0277-786X)，2005，5869：58690S：1-8.

[7] Bruce E Truax. Absolute interferometric testing of spherical surface [J]. Proc. of SPIE(S0277-786X)，1990，1400：61-68.

[8] Katherine Creath，James C Wyant. Absolute measurement of spherical surface [J]. Proc. of SPIE(S0277-786X)，1990，1332：

     1-7.

[9] 4649-4661.

     Karl-Edmund Elssner，Burow R，Grzanna J，et al. Absolute spherical measurement [J]. Appl.Opt(S2155-3165)，1989，28(21)：

[10] Katherine Creath，James C Wyant. Testing spherical surfaces：a fast，quasi-absolute technique [J]. Appl.Opt(S2155-3165)，

     1992，31(22)：4350-4354.

[11] lithography aspheric mirror [J]. American Vacuum Society(S1064-3745)，2002，B20(1)：295-300.

     Otaki K，Yamamoto T，Fukuda Y，et al. Accuracy evaluation of the point diffraction interferometer for extreme ultraviolet

[12] Klaus Mantel ， Eduard Geist ， Irina Harder ， et al. Interferometric quasi-absolute tests for aspherics [J]. Optics

     Letters(S1539-4794)，2009，34(20)：3178-3180.

[13] Chris J Evans，Robert N Kestner. Test optics error removal [J]. Appl.Opt(S2155-3165)，1996，35(7)：1015-1021.