van der Lijn, C., Nurmi, M., Hasanen, E., Pyykönen, J., Salmi, L., Salmikangas, A.-K., Vehkakoski, K., Virmasalo, I., Toivonen, T. and Muukkonen, P. (2022) “Assessing travel time-based accessibility to outdoor ice skating fields for children in Helsinki during the COVID-19 pandemic”, Fennia - International Journal of Geography, 200(1), pp. 6–23. doi: 10.11143/fennia.114590.