ORTIZ ÁLVAREZ, Efrén.
 The Evolution of the party system in the State of Mexico: A comparative study base on the index of the effective number of parties.
<strong>Espacios Públicos</strong>, [S.l.], v. 23, n. 57, p. 107-128, jan. 2022.
ISSN 2954-4750.
Available at: &lt;<a href="https://espaciospublicos.uaemex.mx/article/view/18605" target="_new">https://espaciospublicos.uaemex.mx/article/view/18605</a>&gt;. Date accessed: 19 oct. 2026.
doi: <a href="https://doi.org/10.36677/espaciospublicos.v23i57.18605">https://doi.org/10.36677/espaciospublicos.v23i57.18605</a>.