ExPASy: GlycoMod Tool
- Online software for prediction the possible oligosaccharide structures in glycoproteins from their experimentally determined masses. Maintained by the Swiss Institute of Bioinformatics.
- http://www.expasy.org/tools/glycomod/

Proteoglycans
- Information on various forms, including hyaluronan, proteoglycan groups, glycosaminoglycans, biosynthesis, structure, isolation, separation, purification and analysis at the Department of Anatomy, University of Kuopio, Finland.
- http://www.uku.fi/laitokset/anat/PG/intro.htm