00327nam a2200133Ia 4500 9788126546824 515.35 NAY/I Nayfeh, Ali Hasan Introduction To Perturbation Techniques Wiley India New Delhi 2014 519p Perturbation Techniques BK 6176 6176 0 0 0 0 MAT GBCTL GBCTL F19 2023-12-28 1095.00 515.35 NAY/I 65616 BK