Sommaire

Contents
Earthquake pattern in Central Europe
p. 3-66
Groupoids and the associative law II. (Groupoids with small semigroup distance)
p. 67-83
Multiplication groups of quasigroups and loops I.
p. 85-99
A new proof of Prüfer's theorem
p. 101-104
A service points location problem with Min-Max distance optimality criterion
p. 105-112