Akombor, A.A., Tyona, M.D. and Adelabu, J.S. 2015. A Study on Optical Waveguide Application of Lanthanum III Oxide (LA O ) Thin Film Prepared 2 3 by Sol-gel Method. NIGERIAN ANNALS OF PURE AND APPLIED SCIENCES. 6, (Dec. 2015), 112–123. DOI:https://doi.org/10.46912/napas.16.