L -H · L. Helms · L. L Helms · Lester Helms
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Introduction to Probability Theory with Contemporary Applications | 978-0-486-47418-2 (0-486-47418-6) | 2010 |
| Potential Theory | 978-1-4471-6421-0 (1-4471-6421-0) | 2014 |
| Potential Theory | 978-1-84882-318-1 (1-84882-318-5) | 2010 |