Bibiliopgraphy
                                                 @InCollection(Aristides.A.G.Requicha 1980,
                                                   author=            {Aristides.A.G.Requicha},
                                                   year=                 {1980},
                                                   keywords=        {CAD/CAM,computational geometry,computer graphics,
                                                                                   design and  manufacturing automation,geometric -
                                                                                   -modeling,representation of solids},
                                                   institution=      {College of Engg and  Applied science,The University of
                                                                                  Rochester,New York-14627},
                                                   title=                   { Representations of Rigid Solids:Theory,Methods &
                                                                                   Systems},
                                                   booktitle=           {Computing Surveys},
                                                    month=              { december},
                                                    volume=             {12},
                                                     annote=            {
                                                          Computer based systems for  modeling the geometry of rigid solid
                                                objects are becoming increasingly important in mechanical and civil
                                                engineering ,architecture and other areas.The variety and uses of systems
                                                embodying representations of solids are growing rapidly ,but so are the
                                                difficuilties in assesing  the current designs ,specifying the characteristics
                                                that future systems should exhibit ,and designing systems to meet such
                                                specifications.The first part introduces a simple mathematical frame
                                                workfor characterising certain important aspects of representations.
                                                The second part uses the frame work to describe and compare all of the major
                                                known schemes for representing solids.The third part briefly surveys extant
                                                geometric modeling systems and then applies the concepts developed in the
                                                paper to the high level design of a multiple representation  geometric modeling
                                                system which exhibits a level of reliability  and versatality superior to
                                                that of systems currently used in industrial Computer-Aided-Design and
                                                manufacturing.}
       @incollection (Avraham Margalit and Gary D.Knott1989,
author=                                      {Avraham Margalit,Gary.D.Knott},
year=                                           {1989},
keywords=                                   {Polygons,intersecting,manifold,domain,dangling edges},
institution=                                 {Computer Vision Laboratory,Center for Automation reasearch,University of Maryland,
                                                         College Park,MD 20742  and        Dept of Computer science University of Maryland.},
title=                                              {An algorithm for Computing the Union intersection or differnce of two polygons},
booktitle=                                     {Computer and Graphics},
month=                                         {april},
volume=                                        {13},
pages=                                            {167-183},
annote=                                          {The algorithm uses a boundary representation for the input and output polygons.Its domain includes simple polygons as well as polygons with dangling edges,vertices of degree greater than 2,and holes with in the area of the polygon.It is facilitated by the use of efficient data structures.    - parthasarathy}
 

 
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