MULTICHAMBER REACTORS : A SOLUTION TO THE PROBLEM OF GRADED HETEROINTERFACES IN HOT-WALL VPE SYSTEMS G. Beuchet, D. Clemensat and P. Thebault J. Phys. Colloques, 43 C5 (1982) C5-259-C5-266 DOI: 10.1051/jphyscol:1982530