The provided document is a collection of references related to the hospitality industry, smart manufacturing, and operational research. It includes articles from journals like European Journal of Operational Research, Computers & Chemical Engineering, and Journal of Renewable and Sustainable Energy. The references cover topics such as optimal energy management, sustainability-based asset management, and transformational change in the British and Dutch public sector. The document also explores the use of lean and six sigma methodology to improve operating room efficiency and discusses the role of customer relationship management systems in customer knowledge creation.