DUCKS: Low cost thermal monitoring units for near-vent deployment - Harris, A.; Pirie, D.; Horton, K.; Garbeil, H.; Pilger, E.; Ramm, H.; Hoblitt, R.; Thornber, C.; Ripepe, M.; Marchetti, E.; Poggi, P. (Journal of Volcanology and Geothermal Research, 2005)