TY - JOUR AU - Veljko A. Vujičić TI - Modification of earth's gravity sphere JO - Theoretical and applied mechanics PY - 2013 SP - 121 VL - 40 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.2298/TAM1301121V/ DO - 10.2298/TAM1301121V LA - en ID - 10_2298_TAM1301121V ER -