While the international radio regulations (RR) do not prevent opportunistic access, the application of these regulations largely does not encourage such a concept. This is due to the existence of different elements of restriction within these regulations including the absence of a quantified...

This paper uses fractional integration methods to measure the degree of persistence in historical annual data on the world population over the period 1800-2016. The analysis is carried out for the original series, and also for its log transformation and its growth rate. The results indicate that...