by Chen, Y.F., Ivanov, Z.G., Johansson, L.-G., Kojouharov, R.I., Angelov, I.M., Olsson, E., Roddatis, V.A., Stepantsov, E.A., Tzalenchuk, A.Y., Vasiliev, A.L., Claeson, T.
Published in IEEE transactions on applied superconductivity (01.06.1997)