@article{PDA_1976_6_1_a11,
     author = {Aleksandar Tomi\'c},
     title = {Photographic {Determination} of {Heliographic} {Coordinates} of {Sunspots} {Without}  {Taking} {Double} {Photos}},
     journal = {Publications of the Department of Astronomy},
     pages = {65 - 67},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {1976},
     url = {http://geodesic.mathdoc.fr/item/PDA_1976_6_1_a11/}
}