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- [22] Teaching 2030: What We Must Do for Our Students and Our Public Schools, Now and in the Future EDUCATIONAL FORUM, 2013, 77 (01): : 94 - 95
- [24] Competition will become even fiercer. To maintain our position, we have to invest more in our future. STAHL UND EISEN, 1997, 117 (08): : 39 - 46