@article {:1961::620,
title = "Letters",
journal = "",
parent_itemid = "",
publishercode ="",
year = "1961",
volume = "59",
number = "8",
publication date ="1961-08-01T00:00:00",
pages = "620-621",
itemtype = "ARTICLE",
url = "https://www.ingentaconnect.com/content/saf/jof/1961/00000059/00000008/art00019",
abstract = "",
}