@article{oai:repository.dl.itc.u-tokyo.ac.jp:00041034, author = {Tanaka, Ken-Ichi}, journal = {Scientific papers of the College of General Education, University of Tokyo}, month = {}, note = {application/pdf}, pages = {89--96}, title = {On the Harmonic Functions of Critical or Supercritical Galton-Watson Processes with Continuous Time Parameters}, volume = {31}, year = {1981} }