@article{SMJ2_2013_39_3-4_a0,
     author = {Donchev, Tzanko and Krastanov, Mikhail and Ribarska, Nadezhda and Tsachev, Tsvetomir and Zlateva, Nadia},
     title = {Asen {L.} {Dontchev} (on the occasion of his 65th birthday) and {Vladimir} {M.} {Veliov} (on the occasion of his 60th birthday)},
     journal = {Serdica Mathematical Journal},
     publisher = {mathdoc},
     volume = {39},
     number = {3-4},
     year = {2013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SMJ2_2013_39_3-4_a0/}
}