Fano antiresonances in the absorption spectra of Cr3+ doped La3 Ga5.5 Nb0.5 O14 and La3 Ga5.5 Ta0.5 O14 crystals - Voda M; García Solé J; Jaque F; Vergara I; Kaminskii A; Mill B; Butashin A (Physical Review b, 1994)