Three utilities problem: Difference between revisions

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References: Béla Bollobás
References: url for Henneberg
Line 168:
| last = Henneberg | first = L.
| contribution = Die graphische Statik der starren Körper
| contribution-url = https://archive.org/details/encyklomath104encyrich/page/n367
| pages = 345–434
| title = Encyklopädie der Mathematischen Wissenschaften
| volume = 4.1
| year = 1908}}. See in particular [https://archive.org/stream/encyklomath104encyrich/#page/n425/mode/2up p.&nbsp;403].</ref>
 
<ref name=intuitive>{{citation