Free Piston Resonance Stirling Engine - Solar Impulse Efficient Solution
Frequency-based design of a free piston Stirling engine using genetic algorithm - ScienceDirect
Free piston Stirling engines: A review
Introducing a New System for Energy Recovery of High and Mid-Temperature Renewable Energy Sources: Free Piston Stirling Engine Combined with a Permanent Magnet Linear Synchronous Machine | SpringerLink
Free Piston Resonance Stirling Engine - Solar Impulse Efficient Solution