History of Class polynomials of $\gamma_2=\sqrt[3]{j}$

 Title: Class polynomials of $\gamma_2=\sqrt[3]{j}$-Definition: Let $\Delta<0$ be a discriminant with $\Delta\equiv0$ or $1 \pmod 4$ and-  $3\nmid\Delta$, and let HREF{Hilbert_class_polynomials}[$H_\Delta$] be the Hilbert-  class polynomial of the imaginary quadratic order $\mathcal{O}_\Delta$. The $\gamma_2$+Definition: For an admissible $\Delta$, let $H_\Delta$ be the Hilbert class polynomial+  of $\mathcal{O}_\Delta$ and let $j$ be the modular $j$-invariant. The $\gamma_2$   class polynomial $P_\Delta^{\gamma_2}(x)$ is the unique monic factor of $H_\Delta(x^3)$-  in $\mathbb{Z}[x]$ of degree $h(\Delta)=\deg H_\Delta$, where $\gamma_2^3=j$ and-  $j$ is HREF{Q-expansion_of_the_j-invariant}[the modular $j$-invariant].+  in $\mathbb{Z}[x]$ of degree $\deg H_\Delta$, where $\gamma_2^3=j$. Parameters:   Delta:

   comment-factor: In the complex multiplication method CITE{WikiCM}, the condition     $3\nmid\Delta$ is the one under which $\gamma_2=\sqrt[3]{j}$ gives a class invariant-    for $\mathcal{O}_\Delta$ CITE{PARIpolclass} CITE{Cox}. The factor $Q_\Delta$ has+    for $\mathcal{O}_\Delta$, where $j$ is HREF{Q-expansion_of_the_j-invariant}[the+    modular $j$-invariant] CITE{PARIpolclass} CITE{Cox}. The factor $Q_\Delta$ has     the roots obtained by multiplying each root of $P_\Delta^{\gamma_2}$ by the two     primitive cube roots of unity.