More Excel Services Whitepapers .. .. .. ..
Thanks to Mr Pallot for this one :-
Estimate performance and capacity requirements for Excel Services environments
https://technet2.microsoft.com/Office/f?en-us/library/f0ff6cc9-2f84-4d73-8ac2-390bbcb08c151033.mspx
White papers: Excel Services step-by-step guides
https://technet2.microsoft.com/Office/f?en-us/library/eea3ace8-0863-429a-b1e8-041254ed2fc41033.mspx
Chapter overview: Configure Excel Services
https://technet2.microsoft.com/Office/f?en-us/library/fdcce254-afdc-48f1-a023-8031d0443b8e1033.mspx
Plan access to Excel spreadsheets
https://technet2.microsoft.com/Office/f?en-us/library/93f576a4-e549-4675-b083-7fe4f145ac591033.mspx
https://technet2.microsoft.com/Office/f?en-us/library/ff3ee313-7293-4611-b9ab-175d539878bc1033.mspx
https://technet2.microsoft.com/Office/f?en-us/library/a49883a7-de84-4a66-8fa0-7c7d125f237b1033.mspx
Determine resource requirements to support Excel Services
https://technet2.microsoft.com/Office/f?en-us/library/fb6928ce-49f8-492a-abff-5bd00ed588e21033.mspx
Plan external data connections for Excel Services
https://technet2.microsoft.com/Office/f?en-us/library/7e6ce086-57b6-4ef2-8117-e725de18f2401033.mspx