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PAULSEN, H., POLLEX, A., SINNWELL, V., & VAN BOECKEL, C. A. A. (1988). ChemInform Abstract: Conformational Analysis. Part 28. Conformational Analysis of Heparin-Like Di- and Trisaccharides Containing α-L-Idopyranose Units. ChemInform, 19(32). doi:10.1002/chin.198832301 
10.1002/chin.198832301