S.A. Stout, W. Spackman, J.J. Boon, P.G. Kistemaker and D.F. Bensley, Correlations between the microscopic and chemical changes in wood during peatification and early coalification: a canonical variant study, Int. J. Coal Geol. 13, (1989)
H.J. Bakker, P.C.M. Planken, L.K. Kuipers and A. Lagendijk, Simultaneous phase matching of three second-order nonlinear optical processes in LiNbO3, Opt. Commun. 73, 398-402 (1989)
P.J. van den Hoek, A.W. Kleyn and E.J. Baerends, What is the origin of the repulsive wall in atom-atom potentials, Comments At. Mol. Phys. 23, 93-110 (1989)
H.C. Pan, P.H.F. Reijnen, T.C.M. Horn and A.W. Kleyn, Harpooning in scattering of O2+ from Ag(111): Dependence on initial beam energy and direction, Radiat. Eff. Defects Solids 109, 41-46 (1989)
C.F.A. van Os, A.W. Kleyn, L.M. Lea, A.J.T. Holmes and P.W. van Amersfoort, Transport of negative ions produced at a barium surface located wihtin a multicusp ion source, Rev. Sci. Instrum. 60, 539-546 (1989)
