K. R. Norman, “The Dating of the Historical Buddha (Die Datierung des historischen Buddha). Part 1 (Symposien zur Buddhismusforschung IV.1). Ed. Heinz Bechert”., BSRV, vol. 10, no. 2, pp. 237–244, Jun. 1993, doi: 10.1558/bsrv.v10i2.15216.