Neodymium and europium picrate complexes with 3-picoline-N-oxide (3-picNO) - Nunes, C. C. F.; Zinner, Klaus; Zinner, Lea Barbieri; Carvalho, C. C.; Zukerman-Schpector, Júlio; Vicentini, Geraldo (Inorganica Chimica Acta, 1999)