00254nam a2200097Ia 450000500170000000800410001708200170005810000170007524500240009226000400011620260325112343.0260325s9999||||xx |||||||||||||| ||und||  a523.887 M68B  aMitra, Abhas 0aBlack Hole Paradigm  aNew DelhibPan Macmillan Pub.c2021