Joao Paulo Gois Valdecir Polizelli-Junior Tiago Etiene Eduardo Tejada Antonio Castelo Luis Gustavo Nonato Thomas Ertl Twofold adaptive partition of unity implicits. 1013-1023 2008 24 The Visual Computer 12 http://dx.doi.org/10.1007/s00371-008-0297-x db/journals/vc/vc24.html#GoisPETCNE08