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)

Students' conceptual structure, search process, and outcome while preparing a research proposal: A longitudinal case study. - Mikko Pennanen; Pertti Vakkari (J. Assoc. Inf. Sci. Technol., 2003)

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