@article{AUCMP_1960_1_1_a1,
     author = {Sekanina, Zden\v{e}k},
     title = {The secular decrease of the absolute magnitude of short-periodic comets},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {13--25},
     year = {1960},
     volume = {1},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUCMP_1960_1_1_a1/}
}