7 ms·

Example usage here, https://archive.org/details/onsensationston01helmgoog/page/321/mode/1up https://archive.org/details/onsensationston01helmgoog/page/3... (b

Example usage here, https://archive.org/details/onsensationston01helmgoog/page/321/mode/1up https://archive.org/details/onsensationston01helmgoog/page/3... (by Helmholtz of Helmholtz Equation)

ipsum2 3y ago
I'm very impressed that you were able to find this.