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47A62 Equations involving linear operators, with operator unknowns (2 articles)

• Jódar, Lucas; Navarro, Enrique: Explicit solutions for boundary value problems related to the operator equations $X^{(2)}-AX=0$. (English). Applications of Mathematics, vol. 36 (1991), issue 6, pp. 409-416
• Daneš, Josef: The Hilbert projective metric and an equation in a $C^\ast$-algebra. (English). Czechoslovak Mathematical Journal, vol. 37 (1987), issue 4, pp. 522-532