Bibliography Adam, J., Augath, W., Brouwer, F., Engelhardt, G., Gurtner, W., Harsson, B. G., Ihde, J., Ineichen, D., Lang, H., Luthardt, J., Sacher, M., Schlüter, W., Springer, T., Wöppelmann, G. (1999) Status and Development of the European Height Systems In:…