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Use of priority C(1, 1)-grammars to describe determinate languages

✍ Scribed by I.V. Mironova; L.I. Stanevichene


Publisher
Elsevier Science
Year
1982
Weight
716 KB
Volume
22
Category
Article
ISSN
0041-5553

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## Abstract A novel technique is described for measuring the site selectivity of methods for labelling the major CFC‐alternative, 1,1,1,2‐tetrafluoroethane (HFA 134a), with fluorine‐18 (__t__~1/2~ = 109.7 min). The carbon–carbon bond in radiofluorinated HFA 134a is broken in the ion source of an is