UML sequence diagram combined fragment is an interaction fragment which defines a combination (expression) of interaction fragments.
Sequence Diagram - UML 2 Tutorial | Sparx Systems
Sequence Diagrams | SAP Help Portal
Figure G.2: Translation of parallel fragment sequence diagram into... | Download Scientific Diagram
Everything you need to know about sequence diagrams - Visual Paradigm Blog
multithreading - How to model parallel threads in a UML sequence diagram - Stack Overflow
Explore the UML sequence - IBM Developer
Concurrency in UML
Explore the UML sequence - IBM Developer
multithreading - How to illustrate multiple threads in sequence diagram? - Stack Overflow
Simple Sequence Diagram Template showing parallel processing activities. Click on the image to edit online and download as P… | Sequence diagram, Diagram, Templates
How and why we Optimized the Sequence Diagram in Capella - The official voice of the Obeo experts
Sequence Diagram with Fragment | Enterprise Architect Diagrams Gallery