00314nam a2200109 a 450000500170000002000150001708200200003210000250005224500590007726000500013630000180018620251203091813.0  a0818689730  a006.37,bD, vis  aGlinert, Ephraim, P.  aVisual programming environments: Paradigms and systems  aCaliforniabIEEE Computer society Pressc1990  a661p.c26 cm.