A Molecular Lock with Hydrogen Sulfate as “Key” and Fluoride as “Hand”: Computing Based Insights on the Functioning Mechanism - Paul - 2016 - ChemistrySelect - Wiley Online Library
padlock (lock); padlock keys (keys (locks & enclosures)) - Horniman Museum and Gardens
Swastika A4 Size Multiple Pattern Printed Craft Sheets Set of 30 | Random Colors | for Art and Crafts Like Silhouette, Decals, Alphabets and Letter Making, Origami | Set of 30 (30) : Amazon.in: Home & Kitchen