The PC-board atomic clock, Part 1: Primary and secondary standards
Chip-scale atomic clock approaches performance of modules - EE Times
A New Architecture for Miniaturization of Atomic Clocks Exploiting a Piezoelectric-Thin-Film Vibration From a rack-mount system toward a microchip | Tokyo Tech News | Tokyo Institute of Technology
Chip-scale atomic clock - Wikipedia
10mhz Atomic Clock Rubidium Clock Fe5680 Constant Temperature Crystal Oscillator Frequency Conversion Board Pll Conversion Board - Instrument Parts & Accessories - AliExpress
Atomic Clocks | Microchip Technology
Decoding WWVB from a Sony atomic time radio controlled clock
Miniature Atomic Clock (MAC - SA5X) | Microsemi
How to Use a Real-time Clock Module with the Arduino - Circuit Basics