@article{10_4064_ap_37_3_275_282,
     author = {Micha{\l} Lorens},
     title = {Scalar differential concomitants of first order of a symmetric connexion $\ensuremath{\Gamma}^i_{jk}$ in the two-dimensional space and their applications},
     journal = {Annales Polonici Mathematici},
     pages = {275--282},
     publisher = {mathdoc},
     volume = {37},
     number = {3},
     year = {1980},
     doi = {10.4064/ap-37-3-275-282},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-37-3-275-282/}
}