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2000: JM Kowalski; Steven C Ludwig; William C Hutton; John G Heller
Cervical spine pedicle screws: a biomechanical comparison of two insertion techniques.
Spine 2000;25(22):2865-7.
2000: Steven C Ludwig; JM Kowalski; Charles C Edwards; John G Heller
Cervical pedicle screws: comparative accuracy of two insertion techniques.
Spine 2000;25(20):2675-81.
2000: Steven C Ludwig; JM Kowalski; Scott D Boden
Osteoinductive bone graft substitutes.
European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society 2000;9 Suppl 1():S119-25.
1997: MR Ferrick; JM Kowalski; Edward D Simmons
Reliability of roentgenogram evaluation of pedicle screw position.
Spine 1997;22(11):1249-52; discussion 1253.