@unpublished{TUW-120486, author = {Mendes Cerveira, Pj. and B{\"o}hm, Johannes and Englich, Sigrid and Weber, Robert and Schuh, Harald}, title = {Optimum Parameterization in Estimating Sub-daily Earth Rotation Parameters with Very Long Baseline Interferometry}, year = {2006}, note = {poster presentation: IAU General Assembly, Prag; 2006-08-14 -- 2006-08-25} }