A Note on Grayson’s theorem
Rendiconti del Seminario Matematico della Università di Padova, Tome 131 (2014), pp. 263-280. 
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     author = {Magni, Annibale and Mantegazza, Carlo},
     title = {A {Note} on {Grayson{\textquoteright}s} theorem},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {263--280},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {131},
     year = {2014},
     mrnumber = {3217762},
     zbl = {1296.53133},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_2014__131__263_0/}
}
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Magni, Annibale; Mantegazza, Carlo. A Note on Grayson’s theorem. Rendiconti del Seminario Matematico della Università di Padova, Tome 131 (2014), pp. 263-280. http://www.numdam.org/item/RSMUP_2014__131__263_0/

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