Bibliography (6):

1. Olaf: Bringing an Animated Character to Life in the Physical World [Video]

2. Disney Imagineering Reveals Robotic Olaf Character

3. Proximal Policy Optimization Algorithms

4. Wikipedia Bibliography:

   1. https://en.wikipedia.org/wiki/Walking_robot

      https://en.wikipedia.org/wiki/Walking_robot

   2. https://en.wikipedia.org/wiki/Olaf_(Frozen)

      https://en.wikipedia.org/wiki/Olaf_(Frozen)

   3. Reinforcement learning