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@article{OGDEN68, author = {Ogden, William}, doi = {10.1007/bf01694004}, issn = {1433-0490}, journal = {Mathematical Systems Theory}, month = {September}, number = {3}, pages = {191–194}, publisher = {Springer Science and Business Media LLC}, title = {A helpful result for proving inherent ambiguity}, volume = {2}, year = {1968} }