... 5. Upper and Lower Bounds 5.1 Lower Bounds We could be in a better position to address the question of the relative difficulty of interest if we could establish a rough estimate of the upper ... study one of the more commonly employed methods in lexicography for writing dictionary definitions, namely the use of citation indexes. She was concerned that lexicographers and computational ... other applications, especially author identification (Mosteller and Wallace, 1964, section 3.1) and information retrieval (IR) (van Rijsbergen, 1979, chapter 6; Salton, 1989, section 10.3), though...