>>14
【参考資料】"The most visible change is the use of SI units in the first 10 chapter.Gaussian units
are retained in the later chapters,since such units seem more suited to relarivity and relativistic
electrodynamics than SI. As a remainder of the system of units being employed, the running head
on each left-handed page carries "-SI"or "-G"depending on the chapter."

(John David Jackson , Classical Electrodynamics 3rd.ed.)