1. The Hadamard Determinant Bound  
3. The Ehlich-Wojtas Bound  
4. The Barba Bound and Matrices with \(n \equiv 1 \mod 4\)  
5. A Refined Bound and the Case \(n \equiv 2 \mod 4\)  
6. Ehlich’s Analysis of the Case \(n \equiv 3 \mod 4\)