Odor Problems in Toilets with Reduced Ventilation FrequenciesMadoka Kimura, Takashi Akimoto, Nobuhiro Hirasuga, Yu Sakamoto, Sakurako Yamakita and Hikari SakakibaraE3S Web Conf., 111 (2019) 02025DOI: https://doi.org/10.1051/e3sconf/201911102025