Poinar, George O., Jr. and Johan Haverkamp. “Use of Pyrolysis Mass Spectrometry in the Identification of Amber Samples.” Journal of Baltic Studies 16/3 (1985): 210-221.

Poinar, George O., Jr. and Johan Haverkamp. “Use of Pyrolysis Mass Spectrometry in the Identification of Amber Samples.” Journal of Baltic Studies 16/3 (1985): 210-221.