Funding for this research was provided by:
Ministerstvo školstva, vedy, výskumu a športu Slovenskej republiky
J.W. Fulbright Commission for Educational Exchange in Slovak Republic
Text and Data Mining valid from 2019-04-10
Received: 16 July 2018
Accepted: 27 March 2019
First Online: 10 April 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The research was partly supported by grant NSF/DMS 1405410. M. Chudý received financial support from J.W. Fulbright Commission for Educational Exchange in the Slovak Republic, The Ministry of Education, Science, Research and Sport of the Slovak Republic and the Stevanovich Center for Financial Mathematics.