...(AC)

The cites have appeded by the following coding:

(AA)

- a scientific paper, published in a refereed journal abroad;

(AB)

- paper in other journals abroad;

(AC)

- a paper published in proceedings abroad;

(AE)

- a scientific paper, published in a refereed journal in Estonia;

(AG)

a paper published in proceedings in Estonia;

(KT)

- a manuscript

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