@inbook {ispoglou2015partial, title = {Partial Order Preserving Encryption Search Trees}, booktitle = {Database and Expert Systems Applications}, year = {2015}, pages = {49{\textendash}56}, publisher = {Springer International Publishing}, organization = {Springer International Publishing}, author = {Ispoglou, Kyriakos and Makris, Christos and Stamatiou, Yannis C and Elias C. Stavropoulos and Tsakalidis, Athanasios K and Iosifidis, Vasileios} }