<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">Hello Albrecht, Al and all,</div><div class=""> Albrecht requested a copy of the de Broglie reference in L’Electron magnetique where he shows that even in the absence of external fields, linear momentum is not fully conserved in zitterbewegung motion. The zitterbewegung frequency and amplitude are derived here. I’ve attached the chapter from his book on the analysis of zitterbewegung from his book on the Dirac Equation: L’Electron magnetiique . I think it will be helpful for anyone with a double-looping model of the electron. If Al could translate the key paragraphs into English for us (and others) I think it would be really helpful.</div><div class=""> all the best,</div><div class=""> Richard</div><div class=""> </div></body></html>