@article {728, title = {Spectrometers for multiple pulse NMR}, journal = {Advances in Magnetic Resonance}, volume = {5}, year = {1971}, pages = {117-175}, author = {Ellett, J.D., Jr. and Gibby, M.G. and Haeberlen, U. and Huber, L.M. and Mehring, M. and Pines, A. and Waugh, J.S.} }