mesh - Is this is double-sided plane? - Blender Stack Exchange
Is it better to have models that have double faces or is it better to have a two-sided material instead? - Pipeline & Plugins - Epic Developer Community Forums
Blender Tip - How to make Double Sided Materials - 217 - YouTube
Double Sided Blends (2 Blends) – Plush
Turn off double-sided faces for sculpting... - Modeling - Blender Artists Community
Double-Sided Material w/Solidify and Subdivision? - Materials and Textures - Blender Artists Community
materials - How to set different colors to each side of plane - Blender Stack Exchange
Blender Sushi: RENDER / Wired & Double-Sided Useful Material Tricks
Double-Sided Materials – Blender Knowledgebase
Two sided triangles - CG Cookie | Learn Blender, Online Tutorials and Feedback