Yu, W., Wang, R., & Zhang, C. Geometric Characterization of the Numerical Range of Parallel Sum of Two Orthogonal Projections. Wiley.
Chicago Style (17th ed.) CitationYu, Weiyan, Ran Wang, and Chen Zhang. Geometric Characterization of the Numerical Range of Parallel Sum of Two Orthogonal Projections. Wiley.
MLA (9th ed.) CitationYu, Weiyan, et al. Geometric Characterization of the Numerical Range of Parallel Sum of Two Orthogonal Projections. Wiley.
Warning: These citations may not always be 100% accurate.