@book{29719,
	author = {Hansson, Lennart.},
	title = {Ecological principles of nature conservation :},
	publisher = {Elsevier,},
	year = {1992.},
	series = {Conservation Ecology Series. Principles, Practices and Management},
	address = {London :},
	url = {http://koha.tu.koszalin.pl/cgi-bin/koha/opac-detail.pl?biblionumber=29719}
}