IJ Frigerio, ID Rae and MG Wong. Ring current shielding and molecular motions in Piperazine-2,5-diones
Australian Journal of Chemistry 35(8) 1609 - 1614
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http://dx.doi.org/10.1071/CH9821609
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http://www.publish.csiro.au/nid/51/paper/CH9821609.htm