Sommaire du Fascicule no. 1

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

Sommaire du Fascicule no. 2

Contents
International seminar on elementary excitation processes in crystals
Exact treatment of coherent and incoherent triplet exciton migration
p. 5-8
High intensity excitations in ionic compounds
p. 9-28
Revue of experiments with multiple photon transitions in organic crystals
p. 29-43
On the diameter-depth relationship of lunar craters
p. 45-57
Supplementary catalogue I of original and future comet orbits
p. 59-65
Anamorfoza ve Štěpánského nomogramech s unárním polem
p. 67-75