@inbook{62889490a1ba11ddb6ae000ea68e967b,
title = "Biological insecticides contra insect growth regulators in Polish forestry: a financial cost-benefit analysis",
author = "P. Tarp and F. Helles and S. Zajac",
year = "1999",
language = "English",
isbn = "0-7923-5859-7",
volume = "61",
series = "Forestry Sciences",
publisher = "Kluwer Academic Publishers",
pages = "228--244",
editor = "F. Helles and P. Holten-Andersen and L. Wichmann",
booktitle = "Multiple use of forests and other natural resources : aspects of theory and application",
address = "Netherlands",
}