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 <a href="http://www.sciencedirect.com/science/journal/00193577">_Indagationes Mathematicae_</a>, 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.