@article{10_4153_CMB_2013_039_6,
     author = {Kaveh, Kiumars and Khovanskii, A. G.},
     title = {Note on the {Grothendieck} {Group} of {Subspaces} of {Rational} {Functions} and {Shokurov's} {Cartier} b-divisors},
     journal = {Canadian mathematical bulletin},
     pages = {562--572},
     year = {2014},
     volume = {57},
     number = {3},
     doi = {10.4153/CMB-2013-039-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2013-039-6/}
}