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Spectroscopic assessment of silica–titania and silica–hafnia planar waveguidesAlmeida, R. M.; Marques, A. C.; Pelli, S.; Righini, G. C.; Chiasera, A.; Mattarelli, M.; Montagna, M.; Tosello, C.; Gonçalves, R. R.; Portales, H.; Chaussedent, S.; Ferrari, M.; Zampedri, L. · Philosophical Magazine · 2004