James Blustein David Rowe Ann-Barbara Graff Making Sense in the Margins: A Field Study of Annotation. 252-259 2011 TPDL http://dx.doi.org/10.1007/978-3-642-24469-8_27 conf/ercimdl/2011 db/conf/ercimdl/tpdl2011.html#BlusteinRG11