New to aviation and getting my feet wet in the analysis side. Analyzing a fuselage mounted antenna installation and was told to use these calculations (attached) for fuselage bending. However I can't find what reference/text book this came from and the person who gave it to me is unaware also. Don't have anybody else to ask; working for a design firm with no analysts. Do these calculations come from a text book? I have done some reading online and understand how to go about calculating the fuselage bending but it would be nice to read the text book that these equations came from too.