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It's well know that under a Cobb Douglas production function, capital and labor augmenting technical progress cannot be individually identified. Accordingly, people usually assume Hicks or Harrod neutrality.

But does anyone know if there is a single academic source paper that proved or pointed out this identification issue under Cobb Douglas.

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Maybe the following is useful:

Sato (1970), The Estimation of Biased Technical Progress and the Production Function, International Economic Review, 11, 179-208

JSTOR link

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    $\begingroup$ For an overview, see also Acemoglu's (2009) textbook, especially Section 2.7.2 on "Types of Neutral Technological Progress" $\endgroup$
    – Bertrand
    Commented Jan 11, 2022 at 9:33

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