FAQ: What are stepper drives and how do they work?
Stepper motor driving
How Stepper Motors Work
How to Use a Stepper Motor – Digilent Blog
a) Full-step operation and (b) half-step operation for a two-phase... | Download Scientific Diagram
Stepper Motor Theory
When a stepper motor requires a sequence of four different on-off combinations (e.g., wire 1 on, 2 on, 3 off, 4 off) cycled repeatedly to continue rotating, is a group of four
Control of Stepper Motor by Microcontroller
arduino - "Standard orientation" for stepper motors in data sheets - Electrical Engineering Stack Exchange