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README.md

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 * FTAN method: FTAN.ipynb
 * 2-D Sensitivity kernel of phase velocity for cross-correlation functions (CCFs): kernel2D.ipynb
 * Phase velocity measurements by zero-crossing method: Zero_crossing.ipynb
+* Phase velocity measurements by beamforming method, SPatial Auto Correlation (SAPC) method and Frequency-Bessel (FJ) method: SPAC_weight.ipynb
+* Phase sensitivity kernel of a CCF for a heterogeneous source distribution: kernel2D.ipynb
+* An example of station locations ([Hi-net](https://doi.org/10.17598/NIED.0003)): stations.pickle
+
+Reference 
+* Levshin, A, Ratnikova, L, Berger, J (1992) Peculiarities of surface-wave propagation across central Eurasia. Bull. <i>Seismol. Soc. Am.</i> <b>82</b>(6), 2464–2493. doi:10.1785/BSSA0820062464
+* Ekstrom, G, Abers, G.a, Webb, S.C (2009) Determination of surface-wave phase velocities across USArray from noise and Aki’s spectral formulation. <i>Geophys. Res. Lett.</i> <b>36</b>(18), 5–9. doi:10.1029/2009GL039131
+* Fu, L, Pan, L, Li, Z, Dong, S, Ma, Q, Chen, X (2022) Improved high-resolution 3D vs model of long beach, CA: Inversion of multimodal dispersion curves from ambient noise of a dense array. <i>Geophys. Res. Lett.</i> <b>49</b>(4). doi:10.1029/2021gl097619
+* Nimiya, H, Ikeda, T, Tsuji, T (2023) Multimodal rayleigh and love wave joint inversion for s-wave velocity structures in Kanto basin, japan. <i>J. Geophys. Res.</i> <b>128</b>(1). doi:10.1029/2022jb025017