@article{10_4064_ap_26_1_103_107,
     author = {S. Topa},
     title = {Remarks on algebraic concomitants of the {Riemann-Christoffel} curvature tensor in a three-dimensional space},
     journal = {Annales Polonici Mathematici},
     pages = {103--107},
     publisher = {mathdoc},
     volume = {26},
     number = {1},
     year = {1972},
     doi = {10.4064/ap-26-1-103-107},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-26-1-103-107/}
}