Ultrasonic and Piezoelectric Studies of Phase Transitions in Two-Dimensional CuInP2S6Type Crystals Samulionis, Vytautas ; Banys, Juras ; Vysochanskii, Yulian Abstract Publication: Ferroelectrics Pub Date: May 2009 DOI: 10.1080/00150190902850798 Bibcode: 2009Fer...379...69S