Ebenhoeh, O., Handorf, T., & Heinrich, R. (2005). A cross species comparison of
metabolic network functions. Genome Informatics, 16(1),
203-213. Retrieved from http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=16362923
https://www.jstage.jst.go.jp/article/gi1990/16/1/16_1_203/_pdf.