Bidirectionality and compartmentation of metabolic fluxes are revealed in the dynamics of isotopomer networksSchryer, David; Peterson, Pearu; Paalme, Toomas; Vendelin, MarkoInternational journal of molecular sciences2009 / 4, p. 1697-1718 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2680642/