@article{NCD_2004_4_1_a11,
     author = {Jordan Tabov and Kliment Vasilev and Asen Velchev},
     title = {Mathematical modelling of monetary minting in mediaeval {Bulgaria}},
     journal = {Review of the National Center for Digitization},
     pages = {99 - 104},
     publisher = {mathdoc},
     volume = {4},
     number = {1},
     year = {2004},
     url = {http://geodesic.mathdoc.fr/item/NCD_2004_4_1_a11/}
}