3GPP Release-13/14 is known as LTE-A Pro to differentiate with 3GPP Rel-10/11/12, also known as LTE-Advanced (LTE-A)
Blog entries on 4.5G at 3G4G blog
WHITEPAPERS & PRESENTATIONS
Finding MIMO: On the way to 5G - Northstream, Nov 2016
Inside 3GPP Release 13: Understanding the Standards for LTE-Advanced Enhancements - 5G Americas, Oct 2016
4.5G, Bridging to 5G - Huawei, June 2016
LTE-Advanced Pro: Pushing LTE capabilities towards 5G - Nokia, Dec 2015
Executive Summary: Inside 3GPP Release 13 - 5G Americas, Sep 2015
VIDEO TUTORIALS
Control and User Plane Separation of EPC nodes (CUPS)