Nonadmissible genealogical trees
Rendiconti del Seminario Matematico della Università di Padova, Tome 79 (1988), pp. 71-86 
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     author = {D'Este, Gabriella},
     title = {Nonadmissible genealogical trees},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {71--86},
     year = {1988},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {79},
     mrnumber = {964021},
     zbl = {0741.05022},
     language = {en},
     url = {https://www.numdam.org/item/RSMUP_1988__79__71_0/}
}
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D'Este, Gabriella. Nonadmissible genealogical trees. Rendiconti del Seminario Matematico della Università di Padova, Tome 79 (1988), pp. 71-86. https://www.numdam.org/item/RSMUP_1988__79__71_0/

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[3] D.W. Sharpe - P. Vamos, Injective modules, Cambridge University Press, 1972. | Zbl | MR