Purchase, H.C.H.C.PurchaseAndrienko, NataliaNataliaAndrienkoJankun-Kelly, T.J.T.J.Jankun-KellyWard, M.M.Ward2022-03-042022-03-042008https://publica.fraunhofer.de/handle/publica/21601410.1007/978-3-540-70956-5_3en005book article