The MANTRA campaigns - studying the stratosphere from balloons. - Kimberly Strong; Peter F. Bernath; James Drummond; Hans Fast; John C. McConnell; C. Thomas McElroy; Brendan M. Quine; Theodore G. Shepherd; Brian H. Solheim; Dale Sommerfeldt; Pierre F. Fogal; Frank J. Murcray; et al. (IGARSS, 2002)