!!!! Waves

https://en.wikipedia.org/wiki/Wave
https://en.wikipedia.org/wiki/Transverse_wave
https://en.wikipedia.org/wiki/S-wave
https://en.wikipedia.org/wiki/P-wave
https://en.wikipedia.org/wiki/Plane_wave
https://en.wikipedia.org/wiki/Traveling_plane_wave
https://en.wikipedia.org/wiki/Sinusoidal_plane_wave
https://en.wikipedia.org/wiki/Wavefront
https://en.wikipedia.org/wiki/Phase_(waves)
https://en.wikipedia.org/wiki/Beating_(acoustics)
https://en.wikipedia.org/wiki/Waveform
https://en.wikipedia.org/wiki/Wave_equation
https://en.wikipedia.org/wiki/Hydraulic_jump
https://commons.wikimedia.org/wiki/File:Standing_wave.gif

==== 

https://books.google.com.br/books?hl=en&lr=&id=WnXqCAAAQBAJ&oi=fnd&pg=PA1&dq=L.+M.+Brekhovskikh,&ots=xpCIG2k95d&sig=x3FbrD0UtEUfV4UHWDYam6gruGs#v=onepage&q=L.%20M.%20Brekhovskikh%2C&f=false @@ Book: L. M. Brekhovskikh, Acoustics of Layered Media I: Plane and Quasi-Plane Waves
https://books.google.com.br/books?hl=en&lr=&id=0z3zCAAAQBAJ&oi=fnd&pg=PA1&dq=L.+M.+Brekhovskikh,&ots=aisQXNyOMh&sig=j2xJ4zOPPyQvmWkKDVsU_2t7Oh4#v=onepage&q=L.%20M.%20Brekhovskikh%2C&f=false @@ Book: L. M. Brekhovskikh, Acoustics of Layered Media II: Point Sources and Bounded Beams
https://asa.scitation.org/doi/10.1121/1.401411 @@ L. M. Brekhovskikh (1991), Fundamentals of Ocean Acoustics
https://scholar.google.com.br/scholar?hl=en&as_sdt=0%2C5&q=L.+M.+Brekhovskikh%2C&btnG= @@ Scholar: L. M. Brekhovskikh
==== Figures
file:///home/stolfilocal/posters/wiki-phase/main-f.gif @@ posters/wiki-phase
file:///home/stolfilocal/posters/wiki-waves/main-f.gif @@ posters/wiki-waves