various articles on strings/silk string making/history

1. Huang Shuzhi article on silk strings/history of string making/aesthetics

Huang Shuzhi

2. Raykov article on silk string making

Raykov

3. revised yuguzhai article silk string making chapter --
post discussion with Huang Shuzhi:

Yuguzhai

4. Chen Gongliang on silk strings/history.
Chen Gongliang

5. Xiamen - Xiamen site selling new form of qin string (nylon
wrapping on multi-strand nylon core)