@article{MABA_2012_26_1-2_a1,
     author = {L. Apostolova},
     title = {Hyperbolic {Fourth-R} {Quadratic} {Equation} and {Holomorphic} {Fourth-R} {Polynomials}},
     journal = {Mathematica balkanica},
     pages = {15},
     publisher = {mathdoc},
     volume = {26},
     number = {1-2},
     year = {2012},
     url = {http://geodesic.mathdoc.fr/item/MABA_2012_26_1-2_a1/}
}