IVOA Recommendation: Maintenance of the list of UCD words Version 1.20
  According to what is stated in the IVOA Recommendation "An IVOA standard for Unified Content Descriptors", a procedural document should be created in order to maintain (add, change, suppress words) the standard list of UCD1+ words "The UCD1+ Controlled Vocabulary". This document describes the procedure to maintain the standard list of UCD1+ words. 
Nausicaa Delmotte, Sebastien Derriere, Norman Gray, Robert Mann,   Jonathan McDowell, Thomas Mc Glynn, Francois Ochsenbein, ...
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