In the papers:
http://www.sciencedirect.com/science/article/pii/S0294144905000041; http://www.sciencedirect.com/science/article/pii/S0022123609000597; http://www.sciencedirect.com/science/article/pii/S0022039699936501,
The authors are studying solutions for a PDE, called "Multi-bump", but, isn't clear for me what does it mean.
Thanks in advance