Radoslav Milošević and Daniel A. Romano :

Left Conongruence defined bz coradical of left consistent subset of semigroup with apartness,  1 - 22

Ratko Kravarušić:

An Aproach to the Theory of Perturbations for a Semigroup of Unbounded Linear Operators,  23-32

Vidan govedarica and Milan V. Jovanović:

Some Remarks on the Bernoulli Inequality,  33 - 35