I did a lookup in the American Mathematical Society database for
Schoens and Shoens; only the latter is found, in this article
Data sufficiency for queries on cache
Oded Shmueli and Kurt Shoens
Information Processing Letters 65(4) 209--216, 27 February 1998
https://doi.org/10.1016/S0020-0190(97)00205-6
The PDF file has "Shoens" as well.
In
Diomidis Spinellis
A repository of {Unix} history and evolution
Empirical Software Engineering 22(3) 1372--1404 June 2017
https://doi.org/10.1007/s10664-016-9445-5
the article body also has "Shoens".
In the TeX User Group bibliography archives, I find 7 entries
with the spelling "Shoens", and none with "Schoens".
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