http://localhost:8080/xmlui/handle/123456789/501 Sat, 02 May 2026 22:00:13 GMT 2026-05-02T22:00:13Z http://localhost:8080/xmlui/handle/123456789/502 Mathematical Physics 2 Tue, 01 Mar 2022 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/502 2022-03-01T00:00:00Z