The solution of excess ingredients in hotels deduced by extensible mind mapping Fuyu Ma, Rui Fan, Chongwen Huang, Bifeng Guo, Zihao Li, Qiubin Liu, Penghui Liu and Weitao He ITM Web Conf., 17 (2018) 03004 Published online: 02 February 2018 DOI: 10.1051/itmconf/20181703004