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- [5] AN EXACT RAY THEORETICAL FORMULATION OF THE HELMHOLTZ-EQUATIONJOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 1989, 86 (01): : 234 - 246FOREMAN, TL
- [7] ON SOME PROPERTIES OF SOLUTIONS OF HELMHOLTZ-EQUATIONJOURNAL OF MATHEMATICAL PHYSICS, 1981, 22 (02) : 275 - 276RAMM, AG
- [10] AN EXACT RAY THEORETICAL FORMULATION OF THE HELMHOLTZ-EQUATION - COMMENTSJOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 1990, 88 (05): : 2483 - 2483FLOYD, ER