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References:

[1] Burshtein N.: **On natural exactly covering systems of congruences having moduli occurring at most twice**. Journal of Number Theory (To appear). MR 0412088 | Zbl 0334.10004

[2] Erdös P.: **On a problem concerning congruence systems**. Mat. Lapok 3 (1952), 122-128. MR 0070651

[3] Erdös P.: **Proceedings of the 1963 Number Theory Conference**. University of Colorado. Proposed problem no. 28.

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[6] Porubský Š.: **Natural exactly covering systems of congruences**. Czech. Math. J. 24 (99) (1974), No 4. MR 0354520

[7] Schönheim J., N. Burshtein: **On a conjecture concerning exactly covering systems of congruences**. Israel Journal of Math. 8 (1970), 28-29. DOI 10.1007/BF02771546 | MR 0258724

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[9] Znám Š.: **On the relation between exactly covering systems and rooted trees**. Unpublished.