| title | media type | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|---|
| Critical Point Theory and Its Applications | Broschiert | 978-0-387-51281-5 | 2008 | Martin Schechter |
| Critical Point Theory and Its Applications | Hardcover | 978-0-387-32965-9 | 2006 | " |
| Sign-Changing Critical Point Theory | Broschiert | 978-0-387-56827-0 | 2009 | |
| Sign-Changing Critical Point Theory | Hardcover | 978-0-387-76657-7 | 2008 | |