00555nam a2200157Ia 4500020001500000082002600015100006200041245012400103260003400227300001400261440006100275500000500336653000600341700002200347700002800369  a3540073906  a330.0151993bSe471.VS  aSeminar on Variable structure systems, US-Italy, May 1974  aVariable structure systems with application to economics and biology; proceedingsbcEd. by A. Ruberti and R. R. Mohler  aBerlinbSpringer-Verlagc1975  avi, 320p.  aLecture notes in Economics and Mathematical systemsx111  a  a   aRuberti, A. ; ed.  aMohler, R. R. ; jt. ed.