Allogeneic Hematopoietic Stem Cell Transplantation in Refractory Multiple Myeloma—A Retrospective Multicenter Analysis. - Richardson, T.; Kobbe, G.; Fenk, R.; Schroeder, T.; Crysandt, M.; Neuerburg, C.; Holderried, Tobias A.W.; Schütte, D.; Gödel, P.; Hallek, M.; Scheid, C.; Holtick, U. (European Journal of Haematology, 2025)