Magnetic dimers and trimers in the disordered S=32 spin system BaTi1/2Mn1/2O3 - Garcia, Fernando Assis; Kaneko, U. F.; Granado, E.; Sichelschmidt, J.; Hoelzel, M.; Duque, J. G. S.; Nunes, C. A. J.; Amaral, R. P.; Marques-Ferreira, P; Lora-Serrano, R. (PHYSICAL REVIEW B, 2015)