Advanced Antenna Systems for 5G Network Deployments: Bridging the Gap Between T. Henrik Asplund, David Astely, Peter von Butovitsc. At Book Fountain we believe that good quality and speed of service is what pleases our customers and according to this we have a product guarantee on all our books. Will be clean, not soiled or stained. All pages will be present and undamaged. Books will be free of page markings. Some pages may be slightly dog-eared through previous use. The spine may show some creasing through previous use. Will be completely new and unfolded. Wrapped carefully to prevent damage or curling of book edges. Will be dispatched within 48 hours of order been placed. If you are not happy then neither are we. Rest of the World. At Book Fountain, we believe our customers should feel free to order any of our products in the knowledge that they can return anything back within 30 days of purchasing an item for any reason. We will not make it awkward, if you want to return something then all you have to do is ask! For defects or problems caused before receipt of an item we will of course provide full instructions on how to return the item to us.