id	keyword
american_scientific_journal-8961	waste
american_scientific_journal-8961	solid
american_scientific_journal-8961	ant
american_scientific_journal-8961	externality
american_scientific_journal-8961	management
american_scientific_journal-8961	journal
american_scientific_journal-8961	cost
american_scientific_journal-8961	optimization
american_scientific_journal-8961	objective
american_scientific_journal-8961	colony
american_scientific_journal-8961	solution
american_scientific_journal-8961	research
american_scientific_journal-8961	pheromone
american_scientific_journal-8961	collection
american_scientific_journal-8961	waste management