Update concept.md

Author: oblomov-dev

docs/advanced/technical/concept.md

@@ -151,7 +151,7 @@ Limitations:
 
 By shifting UI control back to the ABAP backend and leveraging SAP UI5 for rendering, abap2UI5 enables maintainable, pragmatic business applications — without the overhead of SPA architectures. For typical enterprise apps — forms, dashboards, transactions — abap2UI5 offers a clean, backend-driven alternative with faster time-to-market and lower complexity.
 
-**Sources::**
+**References:**
 - [htmx in a nutshell](https://htmx.org/docs/#introduction)
 - [HTML Over the Wire](https://signalvnoise.com/svn3/html-over-the-wire/)
 - [Fiori-like web app development in pure ABAP with htmx and Fundamental](https://community.sap.com/t5/technology-blog-posts-by-members/fiori-like-web-app-development-in-pure-abap-with-htmx-and-fundamental/ba-p/13500763)