@article {grolier_notes_1991, title = {Some notes on the question of a so-called {\textquoteright}Unified Classification{\textquoteright}}, journal = {Tools for knowledge organisation and the human interface. Proceedings of the 1st International {ISKO} Conference, Darmstadt, 14-17 August 1990}, year = {1991}, pages = {85{\textendash}108}, author = {Eric de Grolier} }