@ARTICLE{Gargula_Tadeusz_Modification_2002, author={Gargula, Tadeusz}, volume={vol. 51}, number={No 3}, journal={Geodesy and Cartography}, pages={107-114}, howpublished={online}, year={2002}, publisher={Commitee on Geodesy PAS}, abstract={The paper presents a suggestion of modification of Otrebski' s theorem for some special structures of geodetic networks. The modification leads to forming up the conditional equation system with unknowns. A new parameter as a global criterion of evaluation of the quality of the networks characterized by an inhomogenous observation system, has been introduced as well.}, type={Article}, title={Modification of Otrebski's theorem for equivalent observation systems}, URL={http://journals.pan.pl/Content/121488/PDF-MASTER/4_GK_TOM_LI_ZESZYT_3_2002_Gargula_Modyfikacja.pdf}, }