The Number of Abelian Groups of Order at Most x
Journées arithmétiques de Luminy 17-21 Juillet 1989, Astérisque, no. 198-199-200 (1991), pp. 153-163. 
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     author = {Heath-Brown, D. R.},
     title = {The {Number} of {Abelian} {Groups} of {Order} at {Most} $x$},
     booktitle = {Journ\'ees arithm\'etiques de Luminy 17-21 Juillet 1989},
     editor = {Lachaud Gilles},
     series = {Ast\'erisque},
     pages = {153--163},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {198-199-200},
     year = {1991},
     zbl = {0749.11042},
     mrnumber = {1144320},
     language = {en},
     url = {http://archive.numdam.org/item/AST_1991__198-199-200__153_0/}
}
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Heath-Brown, D. R. The Number of Abelian Groups of Order at Most $x$, dans Journées arithmétiques de Luminy 17-21 Juillet 1989, Astérisque, no. 198-199-200 (1991), pp. 153-163. http://archive.numdam.org/item/AST_1991__198-199-200__153_0/

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