Matematika : DBH 4 : [B aukera] / José Ramón Vizmanos ... [et al.] ; [itzulpena, Maider Labaka Loperena, Josu Garate Golmayo (Bakun S.L.)] - Garate, Josu; Labaka Loperena, Maider (Esfera proiektua (Ikasmina), 2008)