@article{TUW-176341, author = {Georgiev, I. and Pashova, Lybka and Schuh, Harald}, title = {Balkan Geodetic Observing System - a Scientific Challenge for the Balkan Countries (BALGEOS)}, journal = {Bulgarian Academy of Sciences NEWS}, year = {2009}, volume = {4}, number = {68}, pages = {3--4} }