Knowledge Profiling: The Basis for Knowledge Organization. - Torkild Thellefsen (Libr. Trends, 2004)

Significance-effects, Semeiotics and Brands. - Torkild Thellefsen; Bent Sørensen; Christian Andersen (Cybern. Hum. Knowing, 2006)

A Semiotic Note on Branding. - Torkild Thellefsen; Bent Sørensen; Christian Andersen (Cybern. Hum. Knowing, 2007)

Evolution, the True Scientist, and His Attraction to the Highest Good: The Growth in the Concrete Reasonableness According to Peirce. - Bent Sørensen; Torkild Thellefsen (Cybern. Hum. Knowing, 2009)

Mind, Matter, and Evolution: An Outline of C. S. Peirce's Evolutionary Cosmogony. - Bent Sørensen; Torkild Thellefsen; Søren Brier (Cybern. Hum. Knowing, 2012)

Foreword: The Scientific Metaphysics of Charles S. Peirce. - Bent Sørensen; Torkild Thellefsen; Phillip Guddemi (Cybern. Hum. Knowing, 2012)

Emotion, information, and cognition, and some possible consequences for library and information science. - Torkild Thellefsen; Martin Thellefsen; Bent Sørensen (J. Assoc. Inf. Sci. Technol., 2013)

The information concept of Nicholas Belkin revisited - some semeiotic comments. - Torkild Thellefsen; Bent Sørensen; Martin Thellefsen (J. Documentation, 2014)

The Concept of Information in Library and Information Science A Field in Search of Its Boundaries: 8 Short Comments Concerning Information. - Torkild Thellefsen; Martin Thellefsen; Bent Sørensen (Cybern. Hum. Knowing, 2015)

The Fallacy of the Cognitive Free Fall in Communication Metaphor: A Semiotic Analysis. - Martin Thellefsen; Torkild Thellefsen; Bent Sørensen (Libr. Trends, 2015)

'Man Is a Bundle of Habits' in a Universe with an Inherent Tendency to Habit Formation. - Bent Sørensen; Torkild Thellefsen; Søren Brier (Cybern. Hum. Knowing, 2018)

Information as signs: A semiotic analysis of the information concept, determining its ontological and epistemological foundations. - Martin Thellefsen; Torkild Thellefsen; Bent Sørensen (J. Documentation, 2018)