@article{AUCMP_1961_2_1_a1,
     author = {Sekanina, Zden\v{e}k},
     title = {Periodical changes in the activity of the {Encke} comet},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {7--14},
     year = {1961},
     volume = {2},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUCMP_1961_2_1_a1/}
}