@article{santos_galo_tachibana_2018,  title={CLASSIFICATION OF LIDAR DATA OVER BUILDING ROOFS USING K-MEANS AND PRINCIPAL COMPONENT ANALYSIS},  volume={24},  ISSN={1982-2170},  url={https://doi.org/10.1590/S1982-21702018000100006},  DOI={10.1590/S1982-21702018000100006},  number={1},  journal={Boletim de Ciências Geodésicas},  publisher={Universidade Federal do Paraná},  author={Santos, Renato César dos and Galo, Mauricio and Tachibana, Vilma Mayumi},  year={2018},  month={Jan},  pages={69–84} }