Bonsai Development Series #2: maintaining low branches on young pines – Bonsai Tonight

https://bonsaitonight.com/2017/11/07/bonsai-development-series-2/#783310

Impressions from the BCI / Asia-Pacific / HWA-FONG / 1st Bonsai Science Symposium – Michael Hagedorn

https://crataegus.com/2017/11/05/impressions-from-the-bci-asia-pacific-hwa-fong-1st-bonsai-science-symposium/amp/