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@article{MM2_1978__24_154539, author = {J\"urgen Hurrelbrink}, title = {The {Elements} of {K2} (...s).}, journal = {Manuscripta mathematica}, pages = {173--178}, publisher = {mathdoc}, volume = {24}, year = {1978}, zbl = {0374.13009}, url = {http://geodesic.mathdoc.fr/item/MM2_1978__24_154539/} }
Jürgen Hurrelbrink. The Elements of K2 (...s).. Manuscripta mathematica, Tome 24 (1978), pp. 173-178. http://geodesic.mathdoc.fr/item/MM2_1978__24_154539/