Roberto Monti, Daniele Morbidelli, “Kelvin transform for Grushin operators and critical semilinear equations”, Duke Math. J., 131:1 (2006)
В. Н. Берестовский, “Подобно однородные локально полные пространства с внутренней метрикой”, Изв. вузов. Матем., 2004, № 11, 3–22 ; V. N. Berestovskii, “Similarly homogeneous locally complete spaces with an intrinsic metric”, Russian Math. (Iz. VUZ), 48:11 (2004), 1–19
Sagun Chanillo, Bernard Helffer, Ari Laptev, “Nonlinear eigenvalues and analytic hypoellipticity”, Journal of Functional Analysis, 209:2 (2004), 425
Lorenzo D'Ambrosio, Sandra Lucente, “Nonlinear Liouville theorems for Grushin and Tricomi operators”, Journal of Differential Equations, 193:2 (2003), 511
Р. Р. Файзуллин, “О связи неголономной метрики на группе Гейзенберга с метрикой Грушина”, Сиб. матем. журн., 44:6 (2003), 1377–1384 ; R. R. Faizullin, “On connection between the nonholonomic metric on the Heisenberg group and the Grushin metric”, Siberian Math. J., 44:6 (2003), 1085–1090
Lorenzo D'Ambrosio, “Hardy inequalities related to Grushin type operators”, Proc. Amer. Math. Soc., 132:3 (2003), 725
P. R. Popivanov, Partial Differential Equations and Spectral Theory, 2001, 245
William Beckner, “On the Grushin operator and hyperbolic symmetry”, Proc. Amer. Math. Soc., 129:4 (2000), 1233
A. Bellaïche, “The tangent space in sub-riemannian geometry”, J Math Sci, 83:4 (1997), 461
Nicola Garofalo, Zhongwei Shen, “Absence of positive Eigenvalues for a class of subelliptic operators”, Math. Ann., 304:1 (1996), 701
A. Bellaïche, “The tangent space in sub-Riemannian geometry”, Journal of Mathematical Sciences (New York), 83:4 (1994), 461–476
Toshihiko Hoshiro, “On Levi-type conditions for hypoellipticity of certain diffrential operators”, Communications in Partial Differential Equations, 17:5-6 (1992), 905
Nicola Garofalo, The IMA Volumes in Mathematics and its Applications, 42, Partial Differential Equations with Minimal Smoothness and Applications, 1992, 139
B. Helffer, J. Sjőstrand, Lecture Notes in Physics, 345, Schrödinger Operators, 1989, 118
North-Holland Mathematics Studies, 147, Operators and Representation Theory, 1988, 285
Heinz Leutwiler, “Best constants in the Harnack inequality for the Weinstein equation”, Aequ math, 34:2-3 (1987), 304
Toshinori Ôaku, “Analytic hypo-ellipticity and propagation of regularity for a system of microdifferential equations with non-involutory characteristics”, Math. Ann., 269:2 (1984), 145
Bernard Helffer, “Conditions ne´cessaires d'hypoanalyticite´pour des ope´rateurs invariantsa`gauche homoge`nes sur un groupe nilpotent gradue´”, Journal of Differential Equations, 44:3 (1982), 460
Linda Preiss Rothschild, “Local solvability of second order differential operators on nilpotent Lie groups”, Ark Mat, 19:1-2 (1981), 145
В. П. Маслов, В. Е. Назайкинский, “Асимптотики для уравнений с особенностями в характеристиках”, Изв. АН СССР. Сер. матем., 45:5 (1981), 1049–1087 ; V. P. Maslov, V. E. Nazaikinskii, “Asymptotics for equations with singularities in the characteristics”, Math. USSR-Izv., 19:2 (1982), 315–347