Computer operation via face orientation. - Philippe Ballard; George C. Stockman (ICPR (1), 1992)

The Manhattan Method: A Fast Cartesian Elevation Map Reconstruction from Range Data. - Philippe Ballard; François Vacherand (ICRA (3), 1993)

Simulation and Understanding of Range Images Acquired in Fast Motion. - Philippe Ballard; François Vacherand (ICRA, 1994)

Controlling a computer via facial aspect. - Philippe Ballard; George C. Stockman (IEEE Trans. Syst. Man Cybern., 1995)