@article{MABA_1988_2_1_a0,
     author = {G. P. Nikolov},
     title = {A {Comparison} {Theorem} in the {Theory} of {Quadrature} {Formulas}},
     journal = {Mathematica balkanica},
     pages = {3},
     year = {1988},
     volume = {2},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/MABA_1988_2_1_a0/}
}