Document Classification, Indexing and Abstracting May be Inherently Difficult Problems.

@inproceedings{fraenkel-1981-document, author = {Aviezri S. Fraenkel}, editor = {Carolyn J. Crouch}, title = {{Document Classification, Indexing and Abstracting May be Inherently Difficult Problems}}, booktitle = {{Theoretical Issues in Information Retrieval, Proceedings of the Fourth International Conference on Information Storage and Retrieval, Oakland, California, USA, May 31 - June 2, 1981}}, pages = {77--82}, publisher = {ACM}, year = {1981}, url = {https://doi.org/10.1145/511754.511766}, doi = {https://doi.org/10.1145/511754.511766} }