@article{1989:endresniggemeyer:knowledge_,
title = {Knowledge based classification systems: Basic issues, a toy system and further prospects},
year = {1989},
note = {},
journal = {KO KNOWLEDGE ORGANIZATION},
pages = {146--156},
author = {Endres-Niggemeyer, Brigitte and Schmidt, Bettina},
volume = {16},
number = {3}
}