1999 Jan, Robert Irion, “Pursuing the Most Extreme Stars”, in Astronomy, volume 27, number 1, page 48:
"They are ideal clocks, much like those you would find in one of Einstein's Gedanken thought experiments "
2005 Aug, Eugene Mirabelli, “The Woman in Schrödinger's Wave Equations”, in Fantasy & Science Fiction, volume 109, number 2, page 143:
John told her about his dissertation, about the equations he had concocted from a gedanken experiment. "What's a gedanken experiment?" she asked him. / "It's where you just think an experiment, but you don't actually do it, you just think it through," he told her.