Collin, E., Rusanen, M., Ackzell, L., Bohnens, J., de Aguiar, A., Diamandis, S., Franke, A., Gil, L., Harvengt, L., Hollingsworth, P., Jenkins, G., Meier-Dinkel, A., Mittempergher, L., Musch, B., Nagy, L., Pâques, M., Pinon, J., Piou, D., Rotach, P., Santini, A., Vanden Broeck, A. and Wolf, H. (2004) “Methods and progress in the conservation of elm genetic resources in Europe”, Forest Systems, 13(1), pp. 261-272. doi: 10.5424/831.