Spacing Repetitions Over Long Timescales: A Review and a Reconsolidation Explanation
Long-term memory, sleep, and the spacing effect.
Chapter 3-Spacing and Testing Effects : A Deeply Critical , Lengthy , and At Times Discursive Review of the Literature
Optimizing schedules of retrieval practice for durable and efficient learning: how much is enough?
A Trainable Spaced Repetition Model for Language Learning
Contracting, equal, and expanding learning schedules: the optimal distribution of learning sessions depends on retention interval.