Changes of search terms and tactics while writing a research proposal: A longitudinal case study. - Pertti Vakkari; Mikko Pennanen; Sami Serola (Inf. Process. Manag., 2003)

Users' conceptual structure, search process and useful information types in the retrieved references. - Pertti Vakkari; Sami Serola; Mikko Pennanen (ASIST, 2005)

The anticipated and assessed contribution of information types in references retrieved for preparing a research proposal. - Sami Serola; Pertti Vakkari (J. Assoc. Inf. Sci. Technol., 2005)

City planners' information seeking behavior: information channels used and information types needed in varying types of perceived work tasks. - Sami Serola (IIiX, 2006)