https://aaas.blog/paper/the-changes-in-the-sub-system-of-the-present-time-forms-in-the-chalkan-language-from-the-middle-of-the-xx-century-to-the-present Change history for The changes in the sub-system of the present time forms in the Chalkan language from the middle of the XX century to the present on the AaaS Knowledge Index. en-us Wed, 24 Jun 2026 05:42:05 GMT