Isaac Iglesias Pablo G. Tahoces Miguel Souto Anxo Martínez de Alegría María J. Lado Juan J. Vidal Lung Segmentation on Postero-anterior Digital Chest Radiographs Using Active Contours. 538-546 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3138&spage=538 2004 conf/sspr/2004 SSPR/SPR db/conf/sspr/sspr2004.html#IglesiasTSALV04