TY - BOOK AU - Jain Alka AU - Prof G C Trigunayak Supervisor AU - University of Delhi. Faculty of Science. Department of Physics and Astrophysics ED - University of Delhi. Faculty of Science. Department of Physics and Astrophysics TI - Role of impurities in polytype growth of lead iodine crystals grown from vapour phase PY - 1996/// KW - PHYSICS ER -