Carballo R, Covelo B, Fernández-Hermida N, García-Martínez E, Lago AB, Vázquez-López EM. Solid state coordination chemistry of copper(II) lactate complexes with the twisted ligands 4,4′-dipyridyldisulfide and bis(4-pyridylthio)methane. Journal of Molecular Structure. 2008;892(1-3):427-432.