Eberhart, Jonathan. When the SST Is Too Slow.... Science News (Society for Science & the Public). 1967-06-03, 91 (22): 528–529 [2010-08-22]. (原始内容存档于2020-03-16).
Eberhart, Jonathan. When the SST Is Too Slow.... Science News (Society for Science & the Public). 1967-06-03, 91 (22): 528–529 [2010-08-22]. (原始内容存档于2020-03-16).