波数ベクトル
Holt, Rinehart, and Winston. p. 177
↑ "This effect has been explained by Musgrave (1959) who has shown that the energy of an elastic wave in an anisotropic medium will not, in general, travel along the same path as the normal to the plane wavefront...", Sound waves in solids by Pollard, 1977. link
↑ Donald H. Menzel (1960). “§10.5 Bloch waves”. Fundamental Formulas of Physics, Volume 2 (Reprint of Prentice-Hall 1955 2nd ed.). Courier-Dover. p. 624. ISBN 0486605965. https://books.google.com/books?id=-miofZvrH2sC&pg=PA624
↑ Physics definition example:Harris, Benenson, Stocker (2002). Handbook of Physics. p. 288. ISBN 978-0-387-95269-7. https://books.google.com/books?id=c60mCxGRMR8C&pg=PA288 .Crystallography definition example: Va?nshte?n (1994). Modern Crystallography. p. 259. ISBN 978-3-540-56558-1. https://books.google.com/books?id=xjIGV_hPiysC&pg=PA259
↑ Va?nshte?n, Boris Konstantinovich (1994). Modern Crystallography. p. 259. ISBN 978-3-540-56558-1. https://books.google.com/books?id=xjIGV_hPiysC&pg=PA259
↑ Fowles, Grant (1968). Introduction to modern optics.