00476nam a2200157Ia 450000500170000000800460001703700160006304000200007904100130009908400220011210000160013424500860015026000530023630000130028936500160030220250508165657.0008  250505s9999    xx            000 0 eng d  aPeriodicals  aFEDLbengcFEDL  aeng2eng  a530.12, SALqFEDL  aSalam Abdus 0aUnification of fundamental forces : the first of the 1988 dirac memorial lectures  aNew York, USAbCambridge University Press c1990  aix,143p.  aINRb433.18