Keller, R. T., Marzuola, J. L., Osting, B., and Weinstein, M. I. Spectral Band Degeneracies of $\frac{\pi}{2}$-Rotationally Invariant Periodic Schrödinger Operators. Retrieved from https://par.nsf.gov/biblio/10225865. Multiscale Modeling & Simulation 16.4 Web. doi:10.1137/18M1171527.

Keller, R. T., Marzuola, J. L., Osting, B., & Weinstein, M. I. Spectral Band Degeneracies of $\frac{\pi}{2}$-Rotationally Invariant Periodic Schrödinger Operators. Multiscale Modeling & Simulation, 16 (4). Retrieved from https://par.nsf.gov/biblio/10225865. https://doi.org/10.1137/18M1171527

Keller, R. T., Marzuola, J. L., Osting, B., and Weinstein, M. I. "Spectral Band Degeneracies of $\frac{\pi}{2}$-Rotationally Invariant Periodic Schrödinger Operators". Multiscale Modeling & Simulation 16 (4). Country unknown/Code not available. https://doi.org/10.1137/18M1171527. https://par.nsf.gov/biblio/10225865.

@article{osti_10225865,
place = {Country unknown/Code not available}, title = {Spectral Band Degeneracies of $\frac{\pi}{2}$-Rotationally Invariant Periodic Schrödinger Operators}, url = {https://par.nsf.gov/biblio/10225865}, DOI = {10.1137/18M1171527}, abstractNote = {}, journal = {Multiscale Modeling & Simulation}, volume = {16}, number = {4}, author = {Keller, R. T. and Marzuola, J. L. and Osting, B. and Weinstein, M. I.}, editor = {null} }