Andritsanos VD, Arabatzi O, Gianniou M, Pagounis V, Tziavos IN, Vergos GS, Zachris E (2015) Comparison of Various GPS Processing Solutions toward an Efficient Validation of the Hellenic Vertical Network: The ELEVATION Project. J Surv Eng, doi: 10.1061/(ASCE)SU.1943-5428.0000164, 04015007. (Available in PDF format from ASCE).