PSp 4 (3) as a symmetric (36, 15, 6)-design
Rendiconti del Seminario Matematico della Università di Padova, Tome 101 (1999), pp. 95-98. 
@article{RSMUP_1999__101__95_0,
     author = {Held, Dieter and De Angelis, J\"org Hrab\v{e} and Pav\v{c}evi\'c, Mario-Osvin},
     title = {$PSp_4$(3) as a symmetric (36, 15, 6)-design},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {95--98},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {101},
     year = {1999},
     mrnumber = {1705282},
     zbl = {0935.05007},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1999__101__95_0/}
}
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Held, Dieter; De Angelis, Jörg Hrabě; Pavčević, Mario-Osvin. $PSp_4$(3) as a symmetric (36, 15, 6)-design. Rendiconti del Seminario Matematico della Università di Padova, Tome 101 (1999), pp. 95-98. http://www.numdam.org/item/RSMUP_1999__101__95_0/

[1] J.H. Conway - R.T. Curtis - S.P. Norton - R.A. Parker - R.A. Wilson, Atlas of Finite Groups, Oxford (1985). | MR | Zbl

[2] Z. Janko, A Characterization of the finite simple group PSp4 (3), Canadian J. Math., 19 (1967), pp. 872-894. | MR | Zbl