Circumstellar disks in the outer Galaxy: the star-forming region NGC 1893 M. Caramazza, G. Micela, L. Prisinzano, L. Rebull, S. Sciortino and J. R. Stauffer A&A, 488 1 (2008) 211-218 Published online: 01 July 2008 DOI: 10.1051/0004-6361:200810132