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- [1] How many farm animals does Switzerland need for optimal land use? AGRARFORSCHUNG SCHWEIZ, 2023, 14 : 236 - 242
- [3] How many conflicts does it need to be unsatisfiable? THEORY AND APPLICATIONS OF SATISFIABILITY TESTING - SAT 2008, PROCEEDINGS, 2008, 4996 : 246 - 256
- [5] How many mother does the child need? ZEITSCHRIFT FUR KINDER-UND JUGENDPSYCHIATRIE UND PSYCHOTHERAPIE, 2008, 36 (04): : 233 - 234
- [9] How many urologists does Canada need? CUAJ-CANADIAN UROLOGICAL ASSOCIATION JOURNAL, 2013, 7 (11-12): : 421 - 421