This morning at 11:44 I happened upon …
This was published as …
Toshiyuki Katsura, Shigeyuki Kondo, Ichiro Shimada,
"On the supersingular K3 surface in characteristic 5 with Artin invariant 1,"
Michigan Mathematical Journal , vol. 63, issue 4 (Dec. 2014), 803–844.
Related material from later today —
See also earlier Log24 remarks on the Hoffman-Singleton graph
and a remark on geometry for Princeton.