Valery V. Kostionk, A Text Book Of CryogenicsАрхивная копия от 11 сентября 2016 на Wayback Machine / Discovery Publishing House, 2003, ISBN 9788171416424, page 22 "1.2 Use of cryogenic products" "...when used as cryogenic agents .. at present, the substances methane, argon, oxygen, nitrogen, hydrogen and helium, are used at cryogenic temperatures on an industrial scale"
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Valery V. Kostionk, A Text Book Of CryogenicsАрхивная копия от 11 сентября 2016 на Wayback Machine / Discovery Publishing House, 2003, ISBN 9788171416424, page 22 "1.2 Use of cryogenic products" "...when used as cryogenic agents .. at present, the substances methane, argon, oxygen, nitrogen, hydrogen and helium, are used at cryogenic temperatures on an industrial scale"
