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1. Operator theory, analytic functions , matrices,and electrical engineering. by Helton, J. William Publication: Rhode Island American mathematical society 1987 Date: 1987 Availability: Items available: School of Theoretical Physics Library [515.8 HEL] (1),
2. Lectures on invariant subspaces. by Helson, Henry Publication: New York Academic Press 1964 Date: 1964 Availability: Items available: School of Theoretical Physics Library [515.8 HEL] (1),
3. Differential operators of mathematical physics. by Hellwig, Gunter Publication: Massachusetts Addison-Wesley Pub.Co. 1967 Date: 1967 Availability: Items available: School of Theoretical Physics Library [515.8 HEL] (1),
4. Groups and geometric analysis : by Helgason, Sigurdur, Publication: Orlando : Academic Press, 1984 . xix, 654 p. : , Includes index. 24 cm. Date: 1984 Availability: Items available: School of Theoretical Physics Library [515.8 HEL] (1),