Can anyone suggest a good book to study Grushin type operators?

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Gro Hovhannisyan

Here some books:

Lars Hormander "The Analysis of Linear PDE III Pseudodifferential operators.

Springer 1985. (Chapter 22.4)

Francois Treves." Introduction to Pseudo differential and Fourier Integral Operators. Plenum Press, 1982

Maged Gumaan Bin-Saad

see

Anh C.T., Hung P.Q., Ke T.D., Phong T.T.: Global attractor for a semilinear parabolic equation involving Grushin operatot. Electron. J. Differ. Equ. 32, 1–11 (2008)

D’Ambrosio L.: Hardy inequalities related to Grushin type operators. Proc. Am. Math. Soc. 132, 725–734 (2004)