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{{LinkOnline|online|https://journal.fi/htf/article/view/65704|free=1}}
{{LinkOnline|DOI|10.1002/ange.19250381509}}
{{LinkOnline|GB|7SQDAAAAMBAJ|PA591}}
{{LinkOnline|ANNO|sci|1942|5|free=1}}
{{LinkOnline|Gallica|https://gallica.bnf.fr/ark:/12148/bpt6k97407713/f49}}

• (online, free)
• (DOI: 10.1002/ange.19250381509)
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