Pseudo-closure-operators
Rendiconti del Seminario Matematico della Università di Padova, Tome 83 (1990), pp. 133-137. 
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     author = {Loonstra, F.},
     title = {Pseudo-closure-operators},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {133--137},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {83},
     year = {1990},
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     url = {http://www.numdam.org/item/RSMUP_1990__83__133_0/}
}
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Loonstra, F. Pseudo-closure-operators. Rendiconti del Seminario Matematico della Università di Padova, Tome 83 (1990), pp. 133-137. http://www.numdam.org/item/RSMUP_1990__83__133_0/

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