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1. Operational mathematics

by Churchill, Ruel V.

Edition: 3rd ed.Publisher: New York McGraw-Hill 1972Availability: Items available for loan: Central Library, BUET [517.7/CHU/1972] (2).

2. Modern operational mathematics in engineering

by Churchill, Ruel V.

Edition: 1st ed.Publisher: New York McGraw-Hill 1944Availability: Items available for loan: Central Library, BUET [517.7/CHU/1944] (1).