Observational constraints on the equation of state of viscous fluid in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si250.svg" display="inline" id="d1e314"><mml:mrow><mml:mi>f</mml:mi><mml:mrow><mml:mo>(</mml:mo><mml:mi>R</mml:mi><mml:mo>,</mml:mo><mml:mi>T</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:mrow></mml:math> gravity

M. Koussour, Aziza Altaibayeva, S. Bekov, Orhan Dönmez, S. Muminov, Javlon Rayimbaev