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[2]
COURANT R, 1931, METHODEN MATHEMATISC, P400
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CREMER L, 1954, ACUSTICA, V4, P273
[4]
Heckl M., 1959, ACUSTICA, V9, P371
[5]
HECKL M, 1960, NONR232200 CONTR
[6]
HECKL M, 1961, AF336167973 CONTR
[7]
Heckl M., 1960, ACTA ACUST UNITED AC, V10, P109
[9]
LYON RH, 1961, NASR47 CONTR