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2. ‘Environmental health aspects of lubricant additives’, Proceedings of 9th International Colloquium, ‘Ecological and Economical Aspects of Tribology’ (ed.), Technische Akademie Esslingen, Ostfildern, Germany, 1994, pp. 11.6.1–11.6.8.
3. , and , Proceedings of the Symposium ‘Eurometalworking '94’, (ed.), Udine, Italy, 1994, p. 057.
4. and , Proceedings of the Symposium ‘Maziva '93’, Poreč, Croatia, 1993, p. 11.
5. , and , Proceedings of the Symposium ‘Eurometalworking '94’, Udine, op. cit., p. 058.