1999 December 10, “Microorganisms in the Accreted Ice of Lake Vostok, Antarctica”, in Science, volume 286, number 5447, →DOI, pages 2144–2147:
( C ) Field emission SEM image of a coccoid bacterium on a 0.02-µm Anopore filter viewed at a magnification of ×150,000 in the decontaminated ice melt.