@article{PDA_1990_18_a1,
     author = {D. Djurovi\'c},
     title = {Solar {Activity} and {Relationships} {Between} {Astronomy} and the {Geosciences}},
     journal = {Publications of the Department of Astronomy},
     pages = {21 },
     publisher = {mathdoc},
     volume = {18},
     year = {1990},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PDA_1990_18_a1/}
}