@article{PDA_1990_18_1_a0,
     author = {D. Djurovi\'c and P. P\^aquet},
     title = {A {Quasi} {Biennal} {Oscillation} in {Solar} {Activity} and {Geophysical} {Phenomena:} {Preliminary} results},
     journal = {Publications of the Department of Astronomy},
     pages = {5 - 20},
     publisher = {mathdoc},
     volume = {18},
     number = {1},
     year = {1990},
     url = {http://geodesic.mathdoc.fr/item/PDA_1990_18_1_a0/}
}