TY - JOUR AU - Józef Joachim Telega TI - Covariant derivative of product tensors JO - Annales Polonici Mathematici PY - 1972 SP - 67 EP - 72 VL - 27 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/ap-27-1-67-72/ DO - 10.4064/ap-27-1-67-72 LA - en ID - 10_4064_ap_27_1_67_72 ER -