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2. Gelfand_Fomin_Calculus_of_Variations
3. Integral Equations by M.D. Raisinghhania
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7. Operation Research by H A Taha
8. Operation Research by P Rama Murthy
9. Fundamental of mathematical and statistics by S C Gupta
10.Inegral Equations by krasnov kiselev makerenko
11.Measure and Integration: A First Course by Thamban Nair
12.functional analysis Limaye
13.functional analysis first course by Thamban nair
14. Topology By Munkers
15. K.D. Joshi Introduction to General Topology
16. Gareth A. Jones, Josephine M. Jones-Elementary Number Theory-Springer (1998)