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Fremg. for fremst. av krystallinske mikroporoese sial-fosfater med kontr. si-innh., krystallinske mikroporoese sial-fosfater med forbedret stabilitet mot deaktivering og en anv. av disse ved fremstilling av olefiner fra metanol
Methods for the preparation of polyborosiloxanes and of silicon and boron oxynitrides,and polyborosiloxanes and silicon and boron oxynitrides obtained thereby