1. A modified solvay-cycle cryogenic refrigerator;Longsworth,1971
2. Refrigeration method and apparatus;Longsworth,1971
3. Dewar and removable refrigerator for maintaining liquefied gas inventory;Longsworth,1980
4. Serviceable refrigerator systems for small superconducting devices;Longsworth;NBS special publication,1981
5. Cryostat with serviceable refrigerator;Longsworth,1981