Intrusive uncertainty quantification for hyperbolic-elliptic systems governing two-phase flow in heterogeneous porous media. Comput. Geosci., (21)4:807--832, 2017. [PUMA: IWSMONTH:12 IWSTYPENR:1 from:timothypraditia IWSAUTHOR:KroekerIlja IWSTYPEDE:Publikationen IWSABT:ls3 IWSYEAR:2017 IWSSUBTYPE:article IWSTYPEEN:articles]