1. Amazon Web Services (2020) Amazon EC2 Pricing. https://aws.amazon.com/ec2/pricing/on-demand/
2. Microsoft Azure (2020) Pricing calculator. https://azure.microsoft.com/en-us/pricing/calculator/
3. Nvidia (2022) GeForce Now. https://www.nvidia.com/en-us/geforce-now/
4. Gurobi (2022) Gurobi Optimizer. https://www.gurobi.com/products/gurobi-optimizer/
5. PlayStation (2022) PS Now. https://www.playstation.com/en-us/ps-now/