Evidence for the existence of protactinium(III) in solid state

This publication has 4 references indexed in Scilit:

• The protactinium(IV) halides
  J. Chem. Soc. A, 1967
• Crystal Structures of the Trifluorides, Trichlorides, Tribromides, and Triiodides of Americium and Curium
  Inorganic Chemistry, 1965
• Preparation and Crystal Data for Lanthanide and Actinide Triiodides
  Inorganic Chemistry, 1964
• Crystal chemical studies of the 5f-series of elements. I. New structure types
  Acta Crystallographica, 1948