signed, titled and dated 'La mère de nuage, Lalan 68' (on the stretcher of the left panel); signed and dated 'Lalan 68' (on the reverse of the left panel); signed, titled and dated 'La mère de nuage, Lalan 68' (on the stretcher of the centre panel); signed and dated 'Lalan 68' (on the reverse of the centre panel); signed, titled and dated 'La mère de nuage, Lalan 68' (on the stretcher and reverse of the right panel)