@article{SLC_1993_31_a1,
     author = {Roberto Pirastu},
     title = {A {Note} on the {Minimality} {Problem} in {Indefinite} {Summation} of {Rational} {Functions}},
     journal = {S\'eminaire lotharingien de combinatoire},
     publisher = {mathdoc},
     volume = {31},
     year = {1993},
     url = {http://geodesic.mathdoc.fr/item/SLC_1993_31_a1/}
}