سال 1398 ش. https://sana.nlai.ir/handle/123456789/787022 Sun, 31 May 2026 13:41:37 GMT 2026-05-31T13:41:37Z Sahand Communications In Mathematical Analysis [Magazine].No 20 https://sana.nlai.ir/handle/123456789/787024 Sahand Communications In Mathematical Analysis [Magazine].No 20 Fri, 01 Nov 1398 00:00:00 GMT https://sana.nlai.ir/handle/123456789/787024 1398-11-01T00:00:00Z