Amer Iqbal
Urs Schreiber
On string junctions in relation to Lie algebras and Lie algebra representations:
On a mysterious duality:
On M-strings/self-dual strings:
and the M-string elliptic genus:
Stefan Hohenegger, Amer Iqbal, M-strings, Elliptic Genera and String Amplitudes, Fortschritte der PhysikVolume 62, Issue 3 (arXiv:1310.1325)
Stefan Hohenegger, Amer Iqbal, Soo-Jong Rey, M String, Monopole String and Modular Forms, Phys. Rev. D 92, 066005 (2015) (arXiv:1503.06983)
On E-strings: