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- [8] Development Trends in Underground Mining Surveying and in Exploratory Drilling Techniques. Neue Bergbautechnik, 1984, 14 (12): : 442 - 449
- [9] CURRENT STATUS OF DRILLING LINE TECHNIQUES AND TRENDS ERDOL & KOHLE ERDGAS PETROCHEMIE, 1978, 31 (09): : 431 - 431
- [10] FLAME-CUTTING STEEL - A BACKGROUND TO CURRENT TRENDS AND FUTURE DEVELOPMENTS ENGINEERING, 1978, 218 (02): : 127 - 128