Measurement of Atmospheric Formaldehyde and Monoaromatic Hydrocarbons using Differential Optical Absorption Spectroscopy during Winter and Summer Intensive Periods in Seoul, Korea - Chulkyu Lee; Young Joon Kim; Sang-Bum Hong; Hanlim Lee; Jinsang Jung; Yeo-Jin Choi; Jungeun Park; Ki-Hyun Kim; Jai-Hoon Lee; Ki-Joon Chun; Hyun-Ho Kim (Water, Air, & Soil Pollution, 2005)