Mihály Makkai. On PCΔ-classes in the theory of models. English with Russian summary. A Magyar Tudományos Akadémia Matematikai Kutató Intézetének Közleményei, ser. A, vol. 9 no. 1–2 (1964), pp. 159–194. - M. Makkai. Remarks on my paper “On PCΔ-classes in the theory of models.” English with Russian summary. A Magyar Tudományos Akadémia Matematikai Kutató Intézetének Közleményei, ser. A, vol. 9 no. 3 (for 1964, pub. 1965), pp. 601–602. | The Journal of Symbolic Logic

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Mihály Makkai. On PCΔ-classes in the theory of models. English with Russian summary. A Magyar Tudományos Akadémia Matematikai Kutató Intézetének Közleményei, ser. A, vol. 9 no. 1–2 (1964), pp. 159–194. - M. Makkai. Remarks on my paper “On PCΔ-classes in the theory of models.” English with Russian summary. A Magyar Tudományos Akadémia Matematikai Kutató Intézetének Közleményei, ser. A, vol. 9 no. 3 (for 1964, pub. 1965), pp. 601–602.

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Mihály Makkai. On PCΔ-classes in the theory of models. English with Russian summary. A Magyar Tudományos Akadémia Matematikai Kutató Intézetének Közleményei, ser. A, vol. 9 no. 1–2 (1964), pp. 159–194. - M. Makkai. Remarks on my paper “On PCΔ-classes in the theory of models.” English with Russian summary. A Magyar Tudományos Akadémia Matematikai Kutató Intézetének Közleményei, ser. A, vol. 9 no. 3 (for 1964, pub. 1965), pp. 601–602.

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Mihály Makkai. On PCΔ-classes in the theory of models. English with Russian summary. A Magyar Tudományos Akadémia Matematikai Kutató Intézetének Közleményei, ser. A, vol. 9 no. 1–2 (1964), pp. 159–194. - M. Makkai. Remarks on my paper “On PCΔ-classes in the theory of models.” English with Russian summary. A Magyar Tudományos Akadémia Matematikai Kutató Intézetének Közleményei, ser. A, vol. 9 no. 3 (for 1964, pub. 1965), pp. 601–602.

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