Sirker, J., Krivnov, V. Y., Dmitriev, D. V., Herzog, A., Janson, O., Nishimoto, S., Drechsler, S.-L., & Richter, J. (2011). J1−J2 Heisenberg model at and close to its z=4 quantum critical point. Physical Review B, 84(14):, pp. 144403-1-144403-8. doi:10.1103/PhysRevB.84.144403.