Charge density wave phenomena in the family of two dimensional monophosphate tungsten bronzes : (PO2)4(WO3)2 m P. FOURY, J.P. POUGET, Z.S. TEWELDEMEDHIN, E. WANG, M. GREENBLATT et D. GROULT J. Phys. IV France, 03 C2 (1993) C2-133-C2-136 DOI: 10.1051/jp4:1993226