- As is usually the case.
1907, Robert William Chambers, chapter IX, in The Younger Set (Project Gutenberg; EBook #14852), New York, N.Y.: D. Appleton & Company, published 1 February 2005 (Project Gutenberg version), OCLC 24962326:
- “A tight little craft,” was Austin’s invariable comment on the matron; […]. ¶ Near her wandered her husband, orientally bland, invariably affable, and from time to time squinting sideways, as usual, in the ever-renewed expectation that he might catch a glimpse of his stiff, retroussé moustache.
- 2008, Firdaus E. Udwadia and Robert E. Kalaba, Analytical Dynamics: A New Approach, Cambridge University Press, ↑ISBN, p.83:
- […] and, the 3n by 3n matrix M is, as usual, diagonal with the masses occurring down the main diagonal in sets of three […].
as is usually the case