https://www.sciencedirect.com/science/article/pii/S105381190291061X (Verlagsversion)
Chee, M., Hon, N., Caplan, D., Lee, H., & Goh, J. (2002). Frequency of concrete words modulates prefrontal activation during semantic judgments. NeuroImage, 16(1), 259-268. doi:10.1006/nimg.2002.1061.