Mark P. Wachowiak Renata Smolíkova Georgia D. Tourassi Adel Said Elmaghraby Estimation of generalized entropies with sample spacing. 95-101 2005 8 Pattern Anal. Appl. 1-2 http://dx.doi.org/10.1007/s10044-005-0247-4 db/journals/paa/paa8.html#WachowiakSTE05