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P. Zeuthen and S.R. Olsen 
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G. Denk and K.O. Honikel 
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M.L. Orovio, M.A. Guerra, M. Ramos and G. Delgado 
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E. Tornberg and K. Persson 
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C.J. Brock and M.B. Enser 
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B. Egelandsdal and J. Mitchell 
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P. Velinov, M. Zhikov and E. Markov 
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D.E. Silverside, L. Nicolaides, A.D. Stephens and A. Sanders 
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M. Sadowska 
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M.G. Harrington and N. Patestos 
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E.D. Paneras and J.G. Bloukas 
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Z. Duda, A. Jarmoluk and J. Miszograj 
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S. Angel, D.M. Kinsman and J.W. Hwang 
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A.-M. Hermansson 
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M.M. Abdel-Baki, S.S. Ibrahim, M.S. El-Dashlouty and Z.M. Fouda 
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H.-J. Raeuber and T. Rossner 
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I.A. Rogov, A.F. Malyutin, A.F. Mitaseva, V.V. Miklashevsky, V.A. Boravsky and A.I. Barasheva 
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G.L. Solntseva, S.I. Sukhanova, R.I. Khlamova, A.P. Sarvazyan, A.G. Lyrchikov and V.N. Shestimirov 
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N.A. Golovkin and S.A. Yevelev 
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S. Tojagić, J. Popov-Raljić and D. Manojlović 
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G. Monin, A. Talmant and C. Valin 
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L. Ojalainen, S.H. Richert and E. Puolanne 
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R.C. Whiting, E.D. Strange, A.L. Cronlund and A.J. Miller 
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K.H. Terpsidis, A.T. Rantsios, P.V. Papavassiliou and A.N. Tsagarakis