Full version

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 XXX

xxx

Received: x x, 2017
Accepted: x x, 20176

pp. xx–xx

Abstract
xxx.

Key words
x, x, x, x

Full text: PDF (xx MB)

XXX

xxx

Received: x x, 2017
Accepted: x x, 2017

pp. x–x

Abstract
xxx.

Key words
x, x, x, x

Full text: PDF (x.x MB)