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- [4] Certification program underway ITE JOURNAL-INSTITUTE OF TRANSPORTATION ENGINEERS, 1998, 68 (04): : 48 - 48
- [8] NEW CERTIFICATION PROGRAM JOURNAL OF THE AMERICAN OSTEOPATHIC ASSOCIATION, 1978, 77 (12): : 896 - 897
- [10] Certification program overlooked ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1997, 31 (08) : A343 - A343