00422nam a2200157Ia 450000100060000000800410000602000180004704000130006508200190007810000230009724500590012026000540017930000110023354600070024465000130025158806140507s9999    xx            000 0 und d  a9780521875745  cPK-LaUMT  a 006.37bGHO-V  aGhosh, Subir Kumar  aVisibility algorithms in the planecGhosh, Subir Kumar  aCambridge,USA:bCambridge University Press,c2007  a318 p.  aEN  aComputer