TY - JOUR A1 - George, L A A1 - Hard, T M A1 - O?Brien, R J T1 - Measurement of free radicals OH and HO2 in Los Angeles smog Y1 - 1999/05/ N1 - R826176 N1 - R823319 JF - JOURNAL OF GEOPHYSICAL RESEARCH J1 - J GEOPHYS RES VL - 104 IS - D9 SP - 11643 EP - 11655 PB - American Geophysical Union ER -