1. Solution of the equation f′(x)=f(1/x);Silberstein;Philos. Mag.,1940
2. Differential equations with involutions;Joseph;Differensial’nye Uravneniya,1969
3. Functional–differential equations with a finite group of argument transformations;Šarkovskiĭ;(Russian) Akad. Nauk Ukrain. SSR, Inst. Mat., Kiev,1978
4. A glimpse into the wonderland of involutions;Joseph;Missouri J. Math. Sci.,2002
5. Pseudo almost periodic solutions for differential equations involving reflection of the argument;Daxiong;J. Korean Math. Soc.,2004