Articles:
Modular Open Systems Approach (MOSA)
Defense Standardization Program – Modular Open Systems Approach (MOSA)
Demystifying MOSA to Simplify Acquisition of Complex Systems
Understanding the MOSA Mandate
CREATING TRULY OPEN ARCHITECTURES USING MOSA
Modular Open System Architecture allows continuous weapon upgrades
OUSD(R&E) Review of MOSA Tools and Practices
NAVAIR leveraging MOSA in avionics systems
https://api.army.mil/e2/c/downloads/2021/07/30/afeaff2d/peo-avn-mosa-infopack-web.pdf