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[en] Metal-Intercalated dodecaborides (MB_1_2) display different low-temperature behaviour depending on the nature of the metal atom M. In this work, we employ a method based on real-space (Wannier) interpolation of phonon and electronic wave functions, to study from first-principles the fully anisotropic Migdal-Eliashberg of compounds with M=Zr, Sc and Lu, which are superconducting with critical temperatures of 5.82, 0.39 and 0.48 K respectively. These compounds have long been conventional considered BCS-like superconductors, but recent recent optical and ARPES experiments displayed several anomalies, which were attributed to the presence of localized phonon modes and possible strong correlation effects.