Use Your Interface
Easing functions specify the speed of animation to make the movement more natural. Real objects don’t just move at a constant speed, and do not start and stop in an instant. This page helps you choose the right easing function.
Anatomy of a touch interaction: Swipe to peep
Article Intro Effects
A collection of awesome six second transitions and animations
Aerotwist - Interaction ProTip #2: Choose your ease
Giving Animations Life — Tictail Makers — Medium
Animation Principles in UI Design: Understanding Easing — Medium