Sommaire

Contents
Tables of $G(u_s, u_B)$ function for calculation of surface conductivity of semiconductors
p. 3-46
Observations of comets and asteroids at the Kleť observatory in the year 1973
p. 47-56
Reflections and coreflections in generalized orthomodular lattices
p. 57-61
Stable and costable preradicals
p. 63-69
$\Lambda$, $R$-transitive groupoids
p. 71-77
Extensive varieties
p. 79-87
Normal congruence relations on division groupoids
p. 89-95