@article{MZ_1988__198_3_173939,
     author = {Ngo Viet Trung and A. Simis},
     title = {The {Divisor} {Class} {Group} of {Ordinary} and {Symbolic} {Blow-ups.}},
     journal = {Mathematische Zeitschrift},
     pages = {479--492},
     publisher = {mathdoc},
     volume = {198},
     number = {3},
     year = {1988},
     zbl = {0626.13003},
     url = {http://geodesic.mathdoc.fr/item/MZ_1988__198_3_173939/}
}