Cohen, Philip R. „The role of natural language in a multimodal interface“, . Proceedings of the 5th annual ACM symposium on User interface software and technology - UIST '92, 1992 — 143–149-bet. DOI:10.1145/142621.142641. ISBN 0897915496.
Cohen, Philip R. „The role of natural language in a multimodal interface“, . Proceedings of the 5th annual ACM symposium on User interface software and technology - UIST '92, 1992 — 143–149-bet. DOI:10.1145/142621.142641. ISBN 0897915496.