1. 1) Dowson, D.: “History of Tribology”, Longman Group Limited, London and New York, p.25 (1979)
2. 2) Dowson, D.: “History of Tribology”, Longman Group Limited, London and New York, p.61 (1979)
3. 3) Dowson, D.: “History of Tribology”, Longman Group Limited, London and New York, p.74 (1979)
4. 4) Baba, T.: “Doraiba no Tame no Taiyakogaku Nyumon”, Guranpuri Shuppan, Tokyo, p.19 (1989)
5. 5) Baba, T.: “Doraiba no Tame no Taiyakougaku Nyumon”, Guranpuri Shuppan, Tokyo, p.20 (1989)