Back in the late 1980s, SuperMemo was first to apply computer technology to optimize intervals between repetitions. We have been the global leader in research on human long-term memory ever since. Spaced repetition may be common in educational apps today, yet SuperMemo is still the unique source of original research and development in this field.
Further improvement of SuperMemo: modification of the function of optimal intervals
Further improvement of SuperMemo: modification of the function of optimal intervals