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- [1] WHY DOES BOGOTA NOT HAVE AT LEAST ONE METRO LINE? AND THE REASONS WHY IT WILL PROBABLY NOT HAVE ONE OPERA-COLOMBIA, 2016, (19): : 139 - 159
- [2] Is it ethical to have more than one fee schedule? JOURNAL OF THE AMERICAN DENTAL ASSOCIATION, 2007, 138 (06): : 823 - 824
- [4] LABORATORY COMPUTER, WHY HAVE ONE - HOW TO GET ONE CANADIAN JOURNAL OF MEDICAL TECHNOLOGY, 1976, 38 (05): : B198 - B198
- [10] THE MAKING OF A DIAMOND MINE: WHY EVERYONE CANNOT HAVE ONE GEMS & GEMOLOGY, 2011, 47 (02): : 108 - 108