no. 4
On modular functions in 2 variables attached to a family of hyperelliptic curves of genus 3
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 16 (1989) no. 4, pp. 557-578. 
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     title = {On modular functions in 2 variables attached to a family of hyperelliptic curves of genus 3},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {557--578},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 16},
     number = {4},
     year = {1989},
     mrnumber = {1052734},
     zbl = {0708.11029},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1989_4_16_4_557_0/}
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Matsumoto, Keiji. On modular functions in 2 variables attached to a family of hyperelliptic curves of genus 3. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 16 (1989) no. 4, pp. 557-578. http://www.numdam.org/item/ASNSP_1989_4_16_4_557_0/

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