NLP Applications of Sinhala: TTS & OCR Ruvan Weerasinghe author Asanka Wasala author Dulip Herath author Viraj Welgama author 2008 text Proceedings of the Third International Joint Conference on Natural Language Processing: Volume-II conference publication weerasinghe-etal-2008-nlp https://aclanthology.org/I08-2142/ 2008