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dubiously rigorous |
→References: still cs1 |
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Line 83:
| year = 1973}}</ref>
<ref name=brown>{{
| last = Brown | first = Theodore
| date = September 1976
Line 160:
| volume = 27}}</ref>
<ref name=prt>{{
| last1 = Postmus | first1 = J. T.
| last2 = Rinnooy Kan | first2 = A. H. G. | author2-link = Alexander Rinnooy Kan
|