Analysis of information sources in references of the Wikipedia article "Cabibbo–Kobayashi–Maskawa matrix" in English language version.
In fact, the Pontecorvo–Maki–Nakagawa–Sakata matrix actually affects the behavior of all leptons, not just neutrinos. Furthermore, a similar trick works for quarks – but then the matrix U is called the Cabibbo–Kobayashi–Maskawa matrix.