I like Shakespeare and Greek tragedy, so let me word it as I'm doing: I desperately need J.H.B. Kemperman's 1956 paper On complexes in a semigroup, but the online archive of Indagationes Mathematicae, where it was originally published (Vol. 18, pp. 247-254), goes back until 1990. Are you aware of any comparatively recent reprint or something like that? Thank you much in advance for any help you can provide.