@article{NSJOM_1989_19_2a_2,
     author = {Pu\v{s}i\'c Nevena},
     title = {A note about a covariant 

 derivative of a harmonic vector field in a {Riemannian} manifold},
     journal = {Novi Sad Journal of Mathematics},
     pages = {33 40},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1989},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1989_19_2a_2/}
}