“…- Lack of information resources – e.g. in home library: gaps in the collection, single copy policy, missing publications; or in internet: limited access to electronic full‐text journal articles (Line, 1963 – shortage of books; Martyn, 1964, 1987; Urquhart and Schofield, 1972; Marsterson and Wilson, 1975; Saracevic et al , 1977; Smith and Granade, 1978; Haag, 1989; Andrews, 1991; Chacha and Irving, 1991; McCarthy, 1995; De Tiratel, 2000; Hull, 2000; Spang and Baker, 2000; Ferguson and Crawford, 2001; Marcella, 2001; Westbrook, 2003; Revere et al , 2007; Lilley, 2008; Haridasan and Khan, 2009; Świgoń, 2006, 2010, 2011).
- Irrelevant information – acquired information is of good quality but it does not satisfy the information need; contradictory information (Haag, 1989, Harris and Dewdney, 1994 – inaccurate or inappropriate information received; Wales, 2000; Hertzum and Pejtersen, 2000; Marcella, 2001; Hall et al , 2000; Rehman and Ramzy, 2004; Swinglehurst, 2005; Eriksson‐Backa, 2008; Shenton, 2008).
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