@article{FPM_2008_14_4_a4,
     author = {E. I. Bunina and P. P. Semenov},
     title = {Elementary equivalence of semigroups of invertible matrices with nonnegative elements over commutative partially ordered rings},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {75--85},
     publisher = {mathdoc},
     volume = {14},
     number = {4},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2008_14_4_a4/}
}