no. 3
Smoothings of cusp singularities via triangle singularities
Compositio Mathematica, Tome 53 (1984) no. 3, pp. 303-316. 
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     author = {Friedman, Robert and Pinkham, Henry},
     title = {Smoothings of cusp singularities via triangle singularities},
     journal = {Compositio Mathematica},
     pages = {303--316},
     publisher = {Martinus Nijhoff Publishers},
     volume = {53},
     number = {3},
     year = {1984},
     mrnumber = {768826},
     zbl = {0594.14006},
     language = {en},
     url = {http://www.numdam.org/item/CM_1984__53_3_303_0/}
}
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Friedman, Robert; Pinkham, Henry. Smoothings of cusp singularities via triangle singularities. Compositio Mathematica, Tome 53 (1984) no. 3, pp. 303-316. http://www.numdam.org/item/CM_1984__53_3_303_0/

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