00321nam a2200121Ia 4500008004100000020001500041082002000056100002100076245004200097260004700139300000800186650000500194140316s9999    xx            000 0 und d  a812041652X  a578.012bGUR/PL  aGurcharan Singh,  aPlant systematics:theory and practice  aNew DelhibOxford and IBH Publishingc2005  a518  a