• animation blend tree - ​http://www.chemical-games.com/?page_id=2201
• blend tree evaluation - ​http://www.chemical-games.com/wp-content/uploads/2012/05/blend_tree_evaluation.pdf
• multithreading - ​https://software.intel.com/en-us/articles/multithreading-the-rendering-pipeline-for-3d-model-animation

Stack Exchange

• ​http://gamedev.stackexchange.com/questions/57645/desire-advice-on-implementing-this-animation-timeline-system\
• data driven animation states - ​http://gamedev.stackexchange.com/questions/27079/data-driven-animation-states