http://localhost:8080/xmlui/handle/123456789/6864 Sat, 04 Apr 2026 21:59:06 GMT 2026-04-04T21:59:06Z http://localhost:8080/xmlui/handle/123456789/6865 Sound waves Ms. Deepa Alexander Sound waves by Ms. Deepa Alexander, The Hindu, Date: 14.11.2012 Wed, 14 Nov 2012 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/6865 2012-11-14T00:00:00Z