Structural Study of TlH2PO4 and TlD2PO4 in the High Temperature Phase S. Rios, W. Paulus, A. Cousson, M. Quilichini, G. Heger, N. Le Calvé and B. Pasquier J. Phys. I France, 5 7 (1995) 763-769 DOI: 10.1051/jp1:1995166