Dielectric properties and phase transition in cesium tetrachlorozincate Cs2ZnCl4 Akira Onodera, Oto Watanabe, Hisashi Haga, Toshio Kikuta, Eisuke Suzuki, Haruyasu Yamashita and Yoichi Shiozaki Ferroelectrics, 125(1-4), 141-146 (1992).