Sommaire

Contents
The efficiency factors $Q_{\text{ext}}$ and $Q_{\text{scat}}$ of the core-mantle grains in the infrared region 2 - 3.4 $\mu$
p. 3-52
The lifetime of C$_2$ and CN molecules in cometary atmospheres
p. 53-56
Determination of Fermi level and some parameters of semiconductors from measurements of transport properties
p. 57-106