author = { Ilsemann, Jan AND Goeb, Simone AND Bachmann, Joerg },

title = { How many soil samples are neccessary to obtain a reliable estimate of mean nitrate concentrations in an agricultural field? },

publisher = {Wiley},

isbn = {1436-8730},

isbn = {1522-2624},

year = {2001},

url = { http://slubdd.de/katalog?TN_libero_mab2 }