1. Introduction  
2. Observations  
3. Results  
3.1. 2.2 µm sources as equivalent ONCs in the CMZ  
3.2. GLOSTAR source selection  
4. Discussion  
4.1. YSOs and their counterparts  
4.2. Properties of the YSO sub-sample  
4.3. Notes on particular sources  
4.4. Star formation in the CMZ  
5. Summary and Conclusions