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Author: Hartfiel, Darald J.

• Hartfiel, Darald J.; Smith, Patricia L.: Remarks on the rows and columns of $P$ in the matrix equation $A=PP^*$. (English). Czechoslovak Mathematical Journal, vol. 29 (1979), issue 1, pp. 57-61
• Hartfiel, Darald J.; Maxson, Carlton J.: A matrix characterization of the maximal groups in $\beta_X$. (English). Czechoslovak Mathematical Journal, vol. 25 (1975), issue 2, pp. 274-278