Sentence:  These solutions can in turn estimate so called volatility modulated Volterra (VMV) processes and L\'{e}vy <WSD>semistationary</WSD> (LSS) processes, which is a class of processes that have been employed to model turbulence, tumor growth and electricity forward and spot prices. 
Meaning of the word marked with <WSD> tags:  Having the same properties over time, although possibly showing different behavior in stability intervals.