Synthesis, characterization and structure of praseodymium , neodymium and europium perrhenate complexes with trans-1,4,dithiane -1,4- dioxide with general formula ('L IND.N'' ('h ind.2'O) IND.4'' (M-TDTD) IND.2' (n-reot)' ('mu'-'n pot.2'TDTD) IND.N'' (RE'c ind.4') IND.2N'ntdtd) - Oliveira, M. A.; Miranda, J M; Castellano, Eduardo Ernesto; Scoralick, E; Zinner, Lea Barbieri; Vicentini, Geraldo (Lanthanide Actinide Research, 1986)