- Eti Mizrahi, Ayşe Hümeyra Bilge, “Toward the Classification of Scalar Nonpolynomial Evolution Equations: Polynomiality in Top Three Derivatives”, Stud Appl Math, 123, no. 3, 2009, 233
- Gülcan Özkum, Ayşe H Bilge, “On the Classification of Fifth Order Quasi-linear Non-constant Separant Scalar Evolution Equations of the KdV-Type”, J. Phys. Soc. Jpn., 81, no. 5, 2012, 054001
- Eti Mizrahi, Ayşe Hümeyra Bilge, “‘Level grading’ a new graded algebra structure on differential polynomials: application to the classification of scalar evolution equations”, J. Phys. A: Math. Theor., 46, no. 38, 2013, 385202
- M. S. Bruzón, M. L. Gandarias, “Classical and nonclassical symmetries for the Krichever-Novikov equation”, Theor Math Phys, 168, no. 1, 2011, 875
- Ayşe Hümeyra Bilge, Eti Mizrahi, “On the classification of scalar evolution equations with non-constant separant”, J. Phys. A: Math. Theor., 50, no. 3, 2017, 035202
- М С Брузон, M S Bruzon, М Л Гандариас, M L Gandarias, “лассические и неклассические симметрии уравнения Кричевера - Новикова”, ТМФ, 168, no. 1, 2011, 24
- Mikhail V. Foursov, Peter J. Olver, Enrique G. Reyes, “On formal integrability of evolution equations and local geometry of surfaces”, Differential Geometry and its Applications, 15, no. 2, 2001, 183