@article{SJC_2012_6_1_a1,
     author = {Tsvetkova, Katya and Tsvetkov, Milcho and Kounchev, Ognyan},
     title = {Photographic {Plate} {Libraries} at {European} {Astronomical} {Observatories}},
     journal = {Serdica Journal of Computing},
     pages = {19--34},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SJC_2012_6_1_a1/}
}