00529nam a2200169Ia 4500 31658 31658 OSt 20200803101119.0 190216s9999||||xx |||||||||||||| ||und|| oclc 515.353 VAS/P Vasishtha, A R 3840 Partial Differential Equations / A R Vasishtha ; Vipin Vasishtha ; A K Vasishtha Krishna Prakashan Media, 2000. Meerut: 236p Mathematics BK ddc 515.353 VAS/P 515.353 VAS/P