Carolina Ramirez, Jun Ohya. OMR of early plainchant manuscripts in square notation: a two-stage system. In Gady Agam, Christian Viard-Gaudin, editors, Document Recognition and Retrieval XVIII - DRR 2011, 18th Document Recognition and Retrieval Conference, part of the IS&T-SPIE Electronic Imaging Symposium, San Jose, CA, USA, January 24-29, 2011, Proceedings. Volume 7874 of SPIE Proceedings, pages 1-10, SPIE, 2011. [doi]