00453nam a2200157Ia 4500008004100000020001400041082001200055100002200067245006000089250000700149260003400156300002700190500000700217600002100224650005000245240925s9999    xx            000 0 und d  a201631717  a006 KAL  aKalawsky  ,Roy S. 4aThe science of virtual reality and virtual environments  aNA  aNew York:bFree Pressc,1993.  axx,405p.bNAfOriginal  aNA  aComputer Science  aComputer science, information & general works