A Hybrid Dynamic Principal Component Analysis Feature Extraction Method to Identify Piston Pin Wear for Binary Classifier Modeling by Hao Yang, Yubin Zhai, Mengkun Zheng, Tan Wang, Dongliang Guo, Jianhui Liang, Xincheng Li, Xianliang Liu, Mingtao Jia, Rui Zhang

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The 2019 Social Protests in Latin America: Global Context and Ecuadorian Case-Study by A. N. Pyatakov

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Holmgren problem for Helmholtz equation with the three singular coefficients by Davlatjon R. Muydinjanov

Subjects: “…multidimensional elliptic equations with three singular coefficients…”
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LIFE PREDICTION OF ROLLING BEARING BASED ON MULTI-RESOLUTION SINGULAR VALUE DECOMPOSITION AND ECNN-LSTM by XIONG Jun, CHEN Lin, WANG ShangQing

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The continous Legendre transform, its inverse transform, and applications by P. L. Butzer, R. L. Stens, M. Wehrens

Subjects: “…behaviour of Legendre functions near singular points.…”
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A uniqueness result for the fractional Schrödinger-Poisson system with strong singularity by Wang Li, Chen Renhua, Zhong Qiaocheng, Wang Jun, Li Fang

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Spin angular momentum of Gaussian beams with several polarization singularities by A.A. Kovalev, V.V. Kotlyar

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Omission or Generalization? Subject-Verb Agreement among Young Norwegian Learners of English by Kristin Killie

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A numerical method for the solution of plane crack problems in finite media by P. S. Theocaris, N. Ioakimidis

Subjects: “…singular integral equations…”
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Order reduction for an RNA virus evolution model by Andrei Korobeinikov, Aleksei Archibasov, Vladimir Sobolev

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Translational and great Darboux cyclides by Lubbes, Niels

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