Jareena Begam, J. et al. 2018. Development of gas sensor array based on phthalocyanine functionalized bilayer TiO2:ZnO thin film towards l iver disease detection. International Journal of Engineering & Technology. 7, 2.21 (Apr. 2018), 232–236. DOI:https://doi.org/10.14419/ijet.v7i2.21.12179.