1. Loosening of total hip components: Cause and prevention;Amstutz,1976
2. Statistical Methods in Medical Research;Armitage,1971
3. Low Fricton Arthroplasty of the Hip. Theory and Practice;Charnley,1979
4. Long-term follow-up of Charnley arthroplasty of the hip;Cupic;Clin Orthop,1979
5. Charnley low-friction arthroplasty of the hip: Long-term results in South Africa;Dall;Clin Orthop,1986