Open access funding provided by TU Wien (TUW). The research work reported in this paper was made from 1998 to 2013 by Prof. Yih-Hsing Pao, Prof. Chi-Fang Chen, and Dr. Piotr Borejko; in June, 2013, Prof. Yih-Hsing Pao passed away; from then on the work was continued until 2017 by Prof. Chi-Fang Chen and Dr. Piotr Borejko. The work was funded in 1998-1999 by the National Science Council (currently the Ministry of Science and Technology) of the Republic of China when Dr. Piotr Borejko was employed for two years as a guest researcher and worked closely with Prof. Yih-Hsing Pao and Prof. Chi-Fang Chen at the National Taiwan University (NTU), Taipei, Taiwan, Republic of China. The work was also funded (short visits) in 2009, 2013, 2014, and 2017 by the TU Wien, Vienna, Austria, when Prof. Chi-Fang Chen visited Dr. Piotr Borejko at the TU Wien; in 2005 and 2011 by the NTU when Dr. Piotr Borejko visited Prof. Yih-Hsing Pao and Prof. Chi-Fang Chen at the NTU; and again in 2015 by the NTU when Dr. Piotr Borejko visited Prof. Chi-Fang Chen at the NTU. The authors are pleased to acknowledge a number of improvements suggested by anonymous reviewers.
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