A.P. Tonchev, J.E. Escher, N. Scielzo, P. Bedrossian, R.S. Ilieva, P. Humby, N. Cooper, P.M. Goddard, V. Werner, W. Tornow, G. Rusev, J.H. Kelley, N. Pietralla, M. Scheck, D. Savran, B. Löher, S.W. Yates, B.P. Crider, E.E. Peters, N. Tsoneva and S. Goriely
