Three utilities problem: Difference between revisions

Content deleted Content added
mNo edit summary
mNo edit summary
Line 235:
| url = http://matwbn.icm.edu.pl/ksiazki/fm/fm15/fm15126.pdf
| volume = 15
| year = 1930
| doi = 10.4064/fm-15-1-271-283|doi-access=free }}</ref>
 
<ref name=larsen>{{citation