In case you are looking for the essay on the = sign, this is what Google Bard said:
The reference to the essay by Andrey Kolmogorov in the paragraph you provided is:
Kolmogorov, A. N. (1930). О понятии числа [On the concept of number]. Matematicheskiy sbornik, 38(3), 3-19.
This essay is in Russian, but an English translation is available in the book "Selected works of A. N. Kolmogorov, Volume I: Mathematics and mechanics" (1991).
The reference to the essay by Andrey Kolmogorov in the paragraph you provided is:
Kolmogorov, A. N. (1930). О понятии числа [On the concept of number]. Matematicheskiy sbornik, 38(3), 3-19.
This essay is in Russian, but an English translation is available in the book "Selected works of A. N. Kolmogorov, Volume I: Mathematics and mechanics" (1991).