Direct experimental test of non-separability and other quantum techniques using continuous variables of lightN. Korolkova, Ch. Silberhorn, O. Glöckl, S. Lorenz, Ch. Marquardt and G. LeuchsEur. Phys. J. D, 18 2 (2002) 229-235DOI: https://doi.org/10.1140/epjd/e20020027