Differences between router interfaces and subinterfaces
Cisco CCNA Virtual LANs (VLANs) Part I
Solved: static nat on subinterfaces - Cisco Community
CISCO RUTEO EIGRP Y SUBINTERFACES - YouTube
Example for Configuring Sub-interfaces to Implement Inter-VLAN Communication - AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 CLI-based Typical Configuration Examples - Huawei
ICTechNotes: Inter-VLAN Routing
How to configure NAT on a Cisco router with multiple vlans