Wullens, H., Leroy, D., & Devillers, M. (2001). Preparation of ternary Bi-La and Bi-Pr oxides from polyaminocarboxylate complexes. International Journal of Inorganic Materials, 3, 309-321. https://doi.org/10.1016/S1466-6049(01)00036-8 (Original work published 2001)