• Calculation of composition of Estonian oil shale and its combustion products on the basis of heating valueArro, Hendrik; Prikk, Arvi; Pihu, TõnuOil shale1998 / 4, p. 329-340 https://www.semanticscholar.org/paper/CALCULATION-OF-COMPOSITION-OF-ESTONIAN-OIL-SHALE-ON-Arro-Prikk/aad8479677f95be443d611a5ae1691226a02fb9e