00301nam a2200121Ia 450000500170000000800410001704100080005808200150006610000240008124500220010526000430012730000090017020260720174820.0260720s2011    xx            000 0 und d  aeng  a530.7 KRIS  aV.Krishnamacharyalu  aScience Education  aNew DelhibNeelkamal Publicationc2011  a356p