Jan Erik Solem Henrik Aanæs Anders Heyden A Variational Analysis of Shape from Specularities using Sparse Data. 26-33 2004 conf/3dpvt/2004 3DPVT http://csdl.computer.org/comp/proceedings/3dpvt/2004/2223/00/22230026abs.htm db/conf/3dpvt/3dpvt2004.html#SolemAH04