counting JNDs (Jont Allen )

Subject: counting JNDs
From:    Jont Allen  <jba(at)RESEARCH.ATT.COM>
Date:    Mon, 1 May 1995 21:53:16 GMT

In 1928 Riesz published a formula for counting JNDs Delta I(I).
This formula says that the number of JNDs between I1 and I2
is given by the integral of 1/Delta(I), integrated between the
limits I1 and I2.

My question is, does any one know if this formula is in any text
books or papers? If so, please give me the most popular reference
or two where I might find it discussed.
jont allen