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Shishkina, Elina L.; Sitnik, Sergei M. (2017-07-15). "The general form of the Euler--Poisson--Darboux equation and application of transmutation method".
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Fusaro, B. A. (1966). "A Solution of a
Singular, Mixed Problem for the Equation of Euler-Poisson- Darboux (EPD)".
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Copson, E. T. (1956-06-12). "On a regular Cauchy problem for the Euler—Poisson—Darboux equation".
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and some sources quote this equation when referring to the Euler–Poisson–Darboux equation.
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114:{\displaystyle u_{x,y}+{\frac {N(u_{x}+u_{y})}{x+y}}=0.}
136:. It plays an important role in solving the classical
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217:{\displaystyle u_{rr}+{\frac {m}{r}}u_{r}-u_{tt}=0,}
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317:{\displaystyle N={\frac {m}{2}}}
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