Dickins, R. S., Howard, J. A. K., Lehmann, C. W., Moloney, J., Parker, D., & Peacock, R. D. (1997).
Structural Rigidity and Luminescence of Chiral Lanthanide Tetraamide Complexes Based on 1,4,7,10-Tetraazacyclododecane. Angewandte Chemie International Edition, 36(5), 521-523.
doi:10.1002/anie.199705211.