| Year | 2001 |
| Date | 10-Aug |
| Volume | 187 |
| Issue | 4,152 |
| Page | 119 |
| Category | Internal Combustion |
| Part | 3 |
| Title | I.C. Engine Design |
| Author | David Boote |
| Notes | Reviews unusual four-stroke engines with sleeve valves. 6.5cc sleeve valve engine to the Nicholson design, Nicholson engine by Bob Dunn, Burt McCollum engine, Barr & Stroud, opposed piston engines, Rotol engine |