Patrick Bosc Allel HadjAli Olivier Pivert On a Proximity-based Tolerant Inclusion. 343-350 2007 EUSFLAT Conf. (2) http://www.eusflat.org/publications/proceedings/EUSFLAT_2007/papers/PIVERT_Olivier_(53).pdf conf/eusflat/2007-2 db/conf/eusflat/eusflat2007-2.html#BoscHP07