References
    -  T. Hosotani, T. Shigemitsu, Y. Kawaguchi, T. Ikebuchi, Study
    on high pressure design of contra-rotating small hydroturbine,
    Int. J. Fluid Mach. Syst., 12 (2019) 268–276. 
 
  -  H.-J. Noh, J.-S. Lee, Y.-J. Kim, Micro-energy harvesting
    based on vortex-induced vibration of cross-flow
    hydroturbine with various cantilever beam configurations,
    IOP Conf. Ser.: Earth Environ. Sci., 240 (2019) 022034,
    doi: 10.1088/1755-1315/240/2/022034. 
 
  -  C.M. Shashikumar, R. Honnasiddaiah, V. Hindasageri,
    V. Madav, Studies on application of vertical axis hydro turbine
    for sustainable power generation in irrigation channels with
    different bed slopes, Renewable Energy, 163 (2021) 845–857. 
 
  -  C. Wang, D. Wang, J. Zhang, Experimental study on isolated
    operation of hydro-turbine governing system of Lunzua
    hydropower station in Zambia, Renewable Energy, 180 (2021)
    1237–1247. 
 
  -  H. Li, H. Diaz, C. Guedes Soares, A developed failure
    mode and effect analysis for floating offshore wind turbine
    support structures, Renewable Energy, 164 (2021) 133–145. 
 
  -  J. Zhang, F. Yang, C. Liang, Y. Zhang, Y. Li, An SVDD-based
    post-processing approach for vibration risk assessment of
    the hydro-turbine-generator in a large hydropower station,
    J. Low Freq. Noise Vibr. Act. Control, 40 (2021) 1309–1334. 
 
  -  Y. Chen, F. Tong, Stability analysis of hydro-turbine governing
    system based on machine learning, Chin. Phys. B, 30 (2021)
    336–343. 
 
  -  J. Zhang, B. Xu, D. Chen, H. Li, Md A. Mahmud, W. Govaerts,
    Numerical bifurcation and continuation of a nonlinear hydroturbine
    governing system in a single-machine infinite-bus
    power system, IET Gener. Transm. Distrib., 14 (2020) 3346–3355. 
 
  -  P. Guo, H. Zhang, D. Gou, Dynamic characteristics of a hydroturbine
    governing system considering draft tube pressure
    pulsation, IET Renewable Power Gener., 14 (2020) 1210–1218. 
 
  -  D. Nan, T, Shigemitsu, T. Ikebuchi, T. Ishiguro, T. Hosotani,
    Pressure fluctuation on casing wall and investigation to tip
    leakage flow of contra-rotating small hydro-turbine, Proc. Inst.
    Mech. Eng., Part A: J. Power Energy, 236 (2022) 506–518. 
 
  -  A. Babu, G. Perumal, H.S. Arora, H.S. Grewal, Enhanced
    slurry and cavitation erosion resistance of deep cryogenically
    treated thermal spray coatings for hydroturbine applications,
    Renewable Energy, 180 (2021) 1044–1055. 
 
  -  B. Xu, X. Luo, M. Egusquiza, W. Ye, J. Liu, E. Egusquiza,
    D. Chen, P. Guo, Nonlinear modal interaction analysis and
    vibration characteristics of a Francis hydro-turbine generator
    unit, Renewable Energy, 168 (2021) 854–864. 
 
  -  K. Rajagopal, H. Jahanshahi, S. Jafari, R. Weldegiorgis,
    A. Karthikeyan, P. Duraisamy, Coexisting attractors in a
    fractional order hydro turbine governing system and fuzzy
    PID based chaos control, Asian J. Control, 23 (2021) 894–907. 
 
  -  S. Kesharwani, K. Tripura, P. Singh, Classical hydraulic ram
    pump performance in comparison with modern hydro-turbine
    pumps for low drive heads, Proc. Inst. Mech. Eng., Part A: J.
    Power Energy, 235 (2021) 1463–1486. 
 
  -  E. Gallego, A. Rubio-Clemente, J. Pineda, L. Velásquez, E. Chica,
    Experimental analysis on the performance of a pico-hydro
    Turgo turbine, J. King Saud Univ., 33 (2020) 266–275. 
 
  -  R. Kumari, K.K. Prabhakaran, K. Desingu, T.R. Chelliah,
    S.V. Appa Sarma, Improved hydroturbine control and future
    prospects of variable speed hydropower plant, IEEE Trans.
    Ind. Appl., 57 (2020) 941–952. 
 
  -  U. Shrestha, Z. Chen, Y.D. Choi, Correlation of the sediment
    properties and erosion in Francis hydro turbine runner,
    Int. J. Fluid Mach. Syst., 12 (2019) 109–118. 
 
  -  D. Zhou, J. Gui, Z.D. Deng, H. Chen, Y. Yu, A. Yu, C. Yang,
    Development of an ultra-low head siphon hydro turbine using
    computational fluid dynamics, Energy, 181 (2019) 43–50. 
 
  -  B. Xu, H.-B. Jun, D. Chen, H. Li, J. Zhang, C.J.C. Blanco,
    H. Shen, Stability analysis of a hydro-turbine governing system
    considering inner energy losses, Renewable Energy, 134 (2019)
    258–266. 
 
  -  K. Song, W.-Q. Wang, Y. Yan ,Numerical and experimental
    analysis of a diffuser-augmented micro-hydro turbine,
	  Ocean Eng., 171 (2019) 590–602.