On the Kodaira dimension of moduli spaces of abelian surfaces
Compositio Mathematica, Volume 72 (1989) no. 2, p. 121-163 
@article{CM_1989__72_2_121_0,
     author = {O'Grady, Kieran G.},
     title = {On the Kodaira dimension of moduli spaces of abelian surfaces},
     journal = {Compositio Mathematica},
     publisher = {Kluwer Academic Publishers},
     volume = {72},
     number = {2},
     year = {1989},
     pages = {121-163},
     zbl = {0711.14025},
     mrnumber = {1030139},
     language = {en},
     url = {http://www.numdam.org/item/CM_1989__72_2_121_0}
}

O'Grady, Kieran G. On the Kodaira dimension of moduli spaces of abelian surfaces. Compositio Mathematica, Volume 72 (1989) no. 2, pp. 121-163. http://www.numdam.org/item/CM_1989__72_2_121_0/

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