Sommerer, Christa and Laurent Mignonneau. Phototropy II In The Interaction ’97, edited by Itsuo Sakane, 48-51. Gifu: IAMAS Academy and... Sommerer, Christa and Laurent Mignonneau. Phototropy II In The Interaction ’97, edited by Itsuo Sakane, 48-51. Gifu: IAMAS Academy and...