TY - JOUR AU - M. Lorens TI - Scalar differential concomitants of the second order of the metrical tensor in three-dimensional Riemann spaces JO - Annales Polonici Mathematici PY - 1970 SP - 71 EP - 76 VL - 24 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/ap-24-1-71-76/ DO - 10.4064/ap-24-1-71-76 LA - en ID - 10_4064_ap_24_1_71_76 ER -