B. P.  Mali, Dash, S. Ranjan, Nikam, S. B., Puthuvakkal, A., Vanka, K., Manoj, K., and Gonnade, R. G., ?Five concomitant polymorphs of a green fluorescent protein chromophore (GFPc) analogue: understanding variations in photoluminescence with pi-stacking interactions?, Acta Crystallographica Section B-Structural Science Crystal Engineering and Materials, vol. 76, pp. 850-864, 2020.