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- [8] AGE STRUCTURE IN THE ENGINEERING INDUSTRY - A PRELIMINARY-STUDY OCCUPATIONAL PSYCHOLOGY, 1957, 31 (03): : 150 - 168
- [9] RADON MEASUREMENTS AND SUBSOIL STRUCTURE - A PRELIMINARY-STUDY NUCLEAR TRACKS AND RADIATION MEASUREMENTS, 1988, 15 (1-4): : 643 - 646
- [10] ON THE THERMAL STRUCTURE OF SUBDUCTION COMPLEXES - A PRELIMINARY-STUDY JOURNAL OF GEOPHYSICAL RESEARCH, 1984, 89 (NB9): : 7709 - 7718