1. Giller SA, Eremeev AV, Kalvin’sh IY, Liepin’sh ÉÉ, Semenikhina VG (1975) Chem Heterocycl Compds 11:1378–1382
2. Kalviņš I I, Stonāns I (2009) WO Patent, WO/2009/071586
3. Kalvins I, Liepins E, Loza E, Dambrova M, Stonans L, Lola D, Kuka J, Pugovics O, Vilskersts R, Grinberga S (2014) US Patent, US 20140088125 A1
4. Silva J (2013) Patent CA 2661357 C, 2013
5. Liepinsh E, Makarova E, Sevostjanovs E, Hartmane D, Cirule H, Zharkova-Malkova O, Grinberga S, Dambrova M (2017) Basic Clin Pharmacol Toxicol 120:450–456