Klaas Westerterp

Body movement and physical activity energy expenditure in children and adolescents: how to adjust for differences in body size and age.

Michael Sjöström, Ulf Ekelund, Agneta Yngve, 2004, The American journal of clinical nutrition.

Validity of hip-mounted uniaxial accelerometry with heart-rate monitoring vs. triaxial accelerometry in the assessment of free-living energy expenditure in young children: the IDEFICS Validation Study.

Yannis P Pitsiladis, Inge Huybrechts, Karin Bammann, 2012, Journal of applied physiology.

Energy balance and obesity: what are the main drivers?

Paul W. Franks, Pattanee Winichagoon, Nahla Hwalla, 2017, Cancer Causes & Control.

Is the ArteACC index a valid indicator of free-living physical activity in adolescents?

Ulf Ekelund, Klaas Westerterp, Jan Aman, 2003, Obesity research.