Louigi Addario-Berry Omid Amini Jean-Sébastien Sereni Stéphan Thomassé Guarding Art Galleries: The Extra Cost for Sculptures Is Linear. 41-52 2008 SWAT http://dx.doi.org/10.1007/978-3-540-69903-3_6 conf/swat/2008 db/conf/swat/swat2008.html#Addario-BerryAST08