@Article{acp-8-5997-2008,
AUTHOR = {Salma, I. and L\'ang, G. G.},
TITLE = {How many carboxyl groups does an average molecule of humic-like substances contain?},
JOURNAL = {Atmospheric Chemistry and Physics},
VOLUME = {8},
YEAR = {2008},
NUMBER = {20},
PAGES = {5997--6002},
URL = {http://www.atmos-chem-phys.net/8/5997/2008/},
DOI = {10.5194/acp-8-5997-2008}
}