Source: https://www.researchgate.net/profile/Lukasz_Rakoczy2/publication/324841253_Influence_of_shell_mould_composition_on_microstructure_of_cast_nickel_alloy/links/5b0a70d94585157f8718fb89/Influence-of-shell-mould-composition-on-microstructure-of-cast-nickel-alloy.pdf