Control of thiophene accumulation in calli of two tagetes species Croes, A.F.; Aarts, A.M.; Bosveld, M.; Breteler, H.; Wullems, G.J. Physiologia Plantarum 76(2): 205-210 1989 0031-9317 10.1111/j.1399-3054.1989.tb05633.x https://eurekamag.com/research/007/159/007159810.php