Reference Architecture: Federated Authentication Service
SAP Discovery Center - Identity Authentication
Authentication as a Service (AaaS) Cloud Based Authentication Service
architecture - Microservice Authentication strategy - Stack Overflow
Central Authentication Service (CAS) implementation using Django microservices, by Adilet Maratov
Service-to-service authorization: A guide to non-user principals
Quest Authentication Services
Network Service Authentication & Authorization with Diameter
What is Authentication Service?