7REQUIEHA A A G,CHAN S C.Representation of geometric features,tolerances and attributes in solid modelers based on constructive geometry[J].Robotics and Automation,1986,2(3):156-166.
9SRINIVASAN V.Geometric tolerancing Ⅰ: Virtual boundary requirement[J].IBM Journal of Research Development,1989,33(2):90-104.
10CLEMENT A,RIVIERE A,SERRE P,et al.The TTRSs:13 constraints for dimensioning and tolerancing[C]//Proeeedings of 5th CIRP Seminars on Computer Aided Tolerancing,April,1997,Ontario,Toronto,Canada.1998:122-131.