no. 1
A result on the integral chow ring of a generic principally polarized complex abelian variety of dimension four
Compositio Mathematica, Tome 34 (1977) no. 1, pp. 49-67. 
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     author = {Barton, Charles and Clemens, C. H.},
     title = {A result on the integral chow ring of a generic principally polarized complex abelian variety of dimension four},
     journal = {Compositio Mathematica},
     pages = {49--67},
     publisher = {Noordhoff International Publishing},
     volume = {34},
     number = {1},
     year = {1977},
     mrnumber = {447237},
     zbl = {0386.14004},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1977__34_1_49_0/}
}
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Barton, Charles; Clemens, C. H. A result on the integral chow ring of a generic principally polarized complex abelian variety of dimension four. Compositio Mathematica, Tome 34 (1977) no. 1, pp. 49-67. http://archive.numdam.org/item/CM_1977__34_1_49_0/

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