I am not sure how to punctuate this sentence (the punctuation below is my best guess):

We refer to the classical research of Oleinik-Petrovsky, Thom and Milnor.

How it should be understood: The original research was a collaboration of two researchers, Oleinik and Petrovsky. Two additional papers were published independently later, one by Thom and one by Milnor.

  • 2
    The standard way is to use semicolons: "the classical research of Oleinik and Petrovsky; Thom; and Milnor." In this case, you can avoid semicolons by saying "the classical research of Oleinik and Petrovsky, of Thom, and of Milnor." – Peter Shor Apr 5 '15 at 14:16
  • I can't see any reason not to use two commas. – Edwin Ashworth Apr 5 '15 at 14:20

Having reference numbers would help you indicate these are three separate papers:

We refer to the classical research of Oleinik-Petrovsky [6], Thom [8], and Milnor [17].

without doing changes to the punctuation.

BTW, an Oxford comma is indicated before "and."

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