Stability analysis of a gravity-driven thermoviscous liquid film flowing over a heated flat substrate Ashna Srivastava, Tara Chand Kumawat and Naveen Tiwari Eur. Phys. J. E, 42 5 (2019) 54 Published online: 14 May 2019 DOI: 10.1140/epje/i2019-11820-1