Here is the link to the e-book. Its on $20 and a great read.
But to answer your question, the "Boring But Big" assistance work is the simplest. After you perform the sets and reps of the program, you simple follow it up with the same exercise for 5x10 @ about 55-60% 1RM.
B-
Ok thank you very much. But how exactly doing 5 sets of 10 reps is going to make you stronger? Isnt the reps range to work on strength between 1 and 5 reps? and 10+ being hypertrophy oriented?