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- [45] An approval system for materials used on gas work? GAS ENGINEERING & MANAGEMENT, 1998, 38 (02): : 29 - 29
- [48] Automated system for measuring the penetration of aerosols through filters Journal of Aerosol Science, 1995, 26 (05):
- [49] SYSTEM IMPROVEMENTS THROUGH USE OF RF CRYSTAL FILTERS IEEE TRANSACTIONS ON VEHICULAR COMMUNICATIONS, 1966, VC15 (01): : 54 - &