TY  - SER
AU  - Vellut,D.
AU  - Jose,J.
AU  - Béhar,E.
AU  - Jose,J.
AU  - Béhar,E.
TI  - Comparative ebulliometry:A simple, reliable technique for accourate measurement of the number average molecular weight of macromolecules: Preliminary studies on heavy crude fractions
U1  - Archivo 
ER  -