APA

Coddington J. A., Scharff N., .Problems with zero-length branches. : .

Chicago

Coddington Jonathan A, Scharff Nikolaj, .Problems with zero-length branches. : .

Harvard

Coddington J. A., Scharff N., .Problems with zero-length branches. : .

MLA

Coddington Jonathan A, Scharff Nikolaj, .: . .