1. The economic implications of learning by doing;Arrow;Review of Economic Studies,1962
2. Strategic intent;Hamel;Harvard Business Review,1989
3. Organizational Learning Through Internal Systems, Strategic Alliances and Networks;Amponsem,1991
4. ‘Leading a global mining company into the 1990s’;a speech to the American Mining Congress,1989
5. ‘Current issues in international mining and RTZ's strategic response’, a speech to Warburg Mining Conference;The New Geography of World Mining,1991