Sommaire du Fascicule no. 1

Contents
Graphs and quasitrivial groupoids
p. 3-15
On strong continuity of derivatives of mappings
p. 17-27
On the radical theory of involution algebras
p. 29-40
A direct transformation between two fundamental matrix canonical forms
p. 41-47
Evolution of process coefficient of the sulphur dioxide in urban zone
p. 49-61
Some remarks on infrared spectroscopy of astronomically interesting silicates
p. 63-68

Sommaire du Fascicule no. 2

Contents
On splitting $k$-systems
p. 3-10
Opérations dérivées des treillis orthomodulaires (Part 3)
p. 11-17
Some remarks to the axiom of prolongation
p. 19-21
Different types of products and subdirectly irreducible
p. 23-30
Properties of operators related to the Boltzmann collision term
p. 31-36
Mechanical properties of some $Cu$-based alloys
p. 37-47
General convolutions motivated by designs
p. 49-66
Sul la theorie de la dimension dans les hypergroupes