Solid state and solution structures of the lanthanide complexes with cryptand (2.2.1): Crystallographic and NMR studies of a dimeric praseodymium (2.2.1) cryptate containing two -hydroxo bridges Rebizant, J.; Spirlet, M.R.; Barthelemy, P.P.; Desreux, J.F. Journal of Inclusion Phenomena and Macrocyclic Chemistry 5(4): 505-513 1987 1388-3127 10.1007/bf00664109 https://eurekamag.com/research/061/948/061948537.php