BURŠA, Milan, KOUBA, J., MULLER, A., RADĚJ, K., TRUE, S. A., VATRT, V., VOJTÍŠKOVÁ, M. Determination of geopotential differences between local vertical datums and realization of a world height system. Studia geophysica et geodaetica. 2001, 45(2), 127-132. ISSN 0039-3169. E-ISSN 1573-1626.