Santos-Lopez de Haro hard sphere equation of state

The Santos-Lopez de Haro hard sphere equation of state is given by ^[1] (Eq. 2):

Failed to parse (Conversion error. Server ("https://wikimedia.org/api/rest_") reported: "Cannot get mml. Server problem."): {\displaystyle Z(\eta )=1+{\frac {1+c_{1}\eta +c_{2}\eta ^{2}+c_{3}\eta ^{3}-(1+2a_{1}\eta +a_{2}\eta ^{2})^{3/2}}{A(1-\eta )^{k}}}}

where $\eta$ is the packing fraction, given by $\eta =v_{d}\rho \sigma ^{d}$ , $Z$ is the compressibility factor, and, for Failed to parse (Conversion error. Server ("https://wikimedia.org/api/rest_") reported: "Cannot get mml. Server problem."): {\displaystyle k=3} , one has (Table I): $a_{1}=0.271232$ , Failed to parse (Conversion error. Server ("https://wikimedia.org/api/rest_") reported: "Cannot get mml. Server problem."): {\displaystyle a_{2}=1.94804} , $A=1.51486$ , Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle c_1=6.87314} , Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle c_2=0.00268343} and Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle c_3= 1.33515} .