@article{MABA_2004_18_3-4_a20,
     author = {B. Piperevski and E. Hadzieva and N. Serafimova and K. Mitkovska-Trendova},
     title = {On a {Class} of {Differential} {Equations} of {Second} {Order} with {Polynomial} {Coefficients"}},
     journal = {Mathematica balkanica},
     pages = {411},
     publisher = {mathdoc},
     volume = {18},
     number = {3-4},
     year = {2004},
     url = {http://geodesic.mathdoc.fr/item/MABA_2004_18_3-4_a20/}
}