@unpublished{TUW-120849, author = {Weber, Robert and Englich, Sigrid and Mendes Cerveira, Pj.}, title = {ERP-Variations on time scales between hours and months derived from GNSS observations}, year = {2007}, note = {poster presentation: AGU Spring Meeting, Acapulco, Mexico; 2007-05-22 -- 2007-05-25} }