Textbook Fundamentals of Service Systems
http://fundamentals-of-service-systems.org/emailform.php?id=s9eF9bYAb39urqWWgo2byy63Wvw%2F%2FPKD9WS8JacJW5ZEzt2F1tSHww71zYB3hKN3n3AQxvJY1wXoqzr%2BvyHRgGWjdvCzk%2FQZJmFNDHxHdfOwV%2Bu5z3ui5TGa9qo1qxQv%2B4ouxVMIG13GEp93nJWKvQ%3D%3D