M. J. Peake, J. Trevelyan, G. Coates, NOVEL BASIS FUNCTIONS FOR THE PARTITION OF UNITY BOUNDARY ELEMENT METHOD FOR HELMHOLTZ PROBLEMS, Blucher Mechanical Engineering Proceedings, Volume 1, 2014, Pages 1319-1325, ISSN 23580828, http://dx.doi.org/10.5151/meceng-wccm2012-18368 (www.proceedings.blucher.com.br/article-details/novel-basis-functions-for-the-partition-of-unity-boundary-element-method-for-helmholtz-problems-9088) Palavras-chave:: ;