TY - JOUR AU - Chang, E AU - Levine, Zachary AU - Shirley, Eric C2 - Physical Review B: Condensed Matter and Materials Physics DA - 2002-01-01 00:01:00 LA - en M1 - 65 PB - Physical Review B: Condensed Matter and Materials Physics PY - 2002 TI - Excitonic Effects on Optical Second-Harmonic Polarizabilities of Semiconductors ER -