OSPF Areas - Index
OSPF Areas (Part 1)
OSPF Areas (Part 2) - Backbone and Normal Areas
OSPF Areas (Part 3) - Stub
OSPF Areas (Part 4) - Totally Stubby
OSPF Areas (Part 5 ) - NSSA
OSPF Areas (Part 6 ) - Totally NSSA
Source: OSPF Areas - Index (//)
From http://blog.movingonesandzeros.net/