Bernardo M. Ábrego Esther M. Arkin Silvia Fernández-Merchant Ferran Hurtado Mikio Kano Joseph S. B. Mitchell Jorge Urrutia Matching Points with Squares. 77-95 2009 41 Discrete & Computational Geometry 1 http://dx.doi.org/10.1007/s00454-008-9099-1 db/journals/dcg/dcg41.html#AbregoAFHKMU09