Kaatz, Forrest H. http://orcid.org/0000-0001-7912-0627
Bultheel, Adhemar http://orcid.org/0000-0001-9562-5297
Article History
Received: 12 December 2017
Accepted: 16 February 2018
First Online: 1 March 2018
Compliance with Ethical Standards
:
: Both authors, F.H. Kaatz and A. Bultheel, declare that there is no conflict of interest, financial or otherwise.