FullOnDrums.com ep22 - The Mid/Side Technique - YouTube
Recording Drums: A Primer on Recording Drums at Home | Tape Op Magazine | Longform candid interviews with music producers and audio engineers covering mixing, mastering, recording and music production.
Five Techniques for Stereo Miking Drums - Shure USA
You're probably miking drums wrong, and how to fix it
Mid-Side Overhead placement - Gearspace.com
Drum Overhead Techniques for Incredible Sounding Drums