Simultaneous inversion for the fractional exponents in the space-time fractional diffusion equation $$\partial _t^\beta u = - {\left( { - \Delta } \right)^{\alpha /2}}u - {\left( { - \Delta } \right)^{\gamma /2}}u$$

Ngartelbaye Guerngar, Erkan Nane, Ramazan Tınaztepe, Süleyman Ulusoy, Hans‐Werner van Wyk