Enabling multihost system architectures with PCI Express switches: Innovation in design through multiroot partitionable switch architecture - PICMG Systems and Technology
Figure 1 from System architecture design of PCIe root complex based on SOPC | Semantic Scholar
Root complex - Wikipedia
What Is a PCI Express Root Port? | Techwalla
How modern multi-processor multi-Root Complex system assigns PCI bus number | CodyWu's Blog