no. 2
Theta series and modular forms of level p 2 M
Compositio Mathematica, Tome 40 (1980) no. 2, pp. 177-241. 
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     author = {Pizer, Arnold},
     title = {Theta series and modular forms of level $p^2M$},
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     publisher = {Sijthoff et Noordhoff International Publishers},
     volume = {40},
     number = {2},
     year = {1980},
     mrnumber = {563541},
     zbl = {0411.10007},
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     url = {http://www.numdam.org/item/CM_1980__40_2_177_0/}
}
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Pizer, Arnold. Theta series and modular forms of level $p^2M$. Compositio Mathematica, Tome 40 (1980) no. 2, pp. 177-241. http://www.numdam.org/item/CM_1980__40_2_177_0/

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