Positron scattering on benzene and cyclohexane: Experiment and modified effective range theoryG. P. Karwasz, R. S. Brusa, Z. Idziaszek and A. KarbowskiEur. Phys. J. Special Topics, 144 (2007) 197-201DOI: https://doi.org/10.1140/epjst/e2007-00127-6