po metodi, ki se uporablja v Franciji, in jo je odobrila Odredba z dne 28. decembra 1977, objavljena v Journal officiel de la République française z dne 18. januarja 1978, strani 514 in 515, in poskusni standard T 73-260 iz junija 1981, ki ga je objavila ,Association française de normalisation (AFNOR),
the method in use in France, approved by Decree of 28 December 1977 published in the Journal officiel de la République française of 18 January 1978, pages 514 and 515, and experimental standard T 73-260 of June 1981 published by the "Association française de normalisation" (AFNOR),