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- [3] HAS ANYTHING REALLY BEEN PROVED ACTA AGRONOMICA ACADEMIAE SCIENTIARUM HUNGARICAE, 1976, 25 (1-2): : 223 - 223
- [7] Has the gene for osteoporosis really been identified? REVUE DU RHUMATISME, 1996, 63 (06): : 445 - 449
- [10] Has Poverty in Croatia Been Really Stagnant? DRUSTVENA ISTRAZIVANJA, 2012, 21 (03): : 607 - 629