@article{MABA_1992_6_3_a10,
     author = {S. M. Markov},
     title = {Extended {Interval} {Arithmetic} {Involving} {Infinite} {Intervals}},
     journal = {Mathematica balkanica},
     pages = {269},
     publisher = {mathdoc},
     volume = {6},
     number = {3},
     year = {1992},
     url = {http://geodesic.mathdoc.fr/item/MABA_1992_6_3_a10/}
}