**Author details**

Andrzej Gecow†

\*Address all correspondence to: andrzejgecow@gmail.com; gecow@op.pl

† My personal page is: https://sites.google.com/site/andrzejgecow/home This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

© 2020 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
