Models and observations of the impact of natural hydrocarbons on rural ozone. - Trainer, ,M.,.; Williams, ,E..J.,.; Parrish, ,D..D.,.; Buhr, ,M..P.,.; Allwine, ,E..J.,.; Westberg, ,H..H.,.; Fehsenfeld, ,F..C.,.; and Liu, ,S..C.. (Nature, 1987)