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Search Symbol (Half-width) Description of Search Symbols
Space "AND" indicates the intertwining of key terms used in a search
Double Quotation Marks ("") ( " " ) Double quotation marks indicate the beginning and end of a phrase, and the search will only include terms that appear in the same order of those within the quotations. Example: "image process" : " image process "
? Indicates a variable letter. Entering two ? will indicate two variable letters, and so on. Example: "Appl?", search results will yield apple, apply… e , appl y … ( (often used to English word searches) )
* Indicates an unlimited number of variable letters to follow, from 1~n. Example: Enter "appl*", search results will yield apple, apples, apply, applied, application…(often used in English word searches) e , appl es , appl y , appl ied , appl ication … ( (often used to English word searches) )

Boolean logic combinations of key words is a skill used to expand or refine search parameters.
(1) AND (1) AND: Refines search parameters
(2) OR (2) OR: Expands search parameters (3) NOT: Excludes irrelevant parameters


DOI stands for Digital Object Identifier ( D igital O bject I dentifier ) ,
and is the unique identifier for objects on the internet. It can be used to create persistent link and to cite articles.

Using DOI as a persistent link

To create a persistent link, add「」 「 」 before a DOI.
For instance, if the DOI of an article is 10.5297/ser.1201.002 , you can link persistently to the article by entering the following link in your browser: 10.5297/ser.1201.002
The DOI link will always direct you to the most updated article page no matter how the publisher changes the document's position, avoiding errors when engaging in important research.

Cite a document with DOI

When citing references, you should also cite the DOI if the article has one. If your citation guideline does not include DOIs, you may cite the DOI link.

DOIs allow accurate citations, improve academic contents connections, and allow users to gain better experience across different platforms. Currently, there are more than 70 million DOIs registered for academic contents. If you want to understand more about DOI, please visit airiti DOI ) 。

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  1. Applebaum M. The uterine biophysical profile. (1995) Ultrasound Obstet Gynecol 5:67-8. Chien LW, Tzeng CR, Chang SR, Chen AC. (1995) The correlation of the embryo implantation rate with uterine arterial impedance in in vitro fertilization and embryo transfer. Early Pregnancy 1995 1:27-32. Desai, NN, Goldstein J, Rowland DY, Goldfarb JM. (2000) Morphological evaluation of human embryos and derivation of an embryo quality scoring system specific for day 3 embryos: a preliminary study. Hum Reprod 15:2190-6. Fanchin R (2001) Assessing uterine receptivity in 2001: Ultrasonographic glances at the new millennium. Ann NY Acad Sci 943: 185-202. Noe M, Kunz G, Herbertz M, Mall G, Leyendecker G. (1999) The cyclic pattern of the immunocytochemical expression of oestrogen and progesterone receptors in human myometrial and endometrial layers: characterization of the endometrial— subendometrial unit. Hum Reprod 14:190-7. Tekay A, Martikainen H, Jouppila P. (1996) The clinical value of transvaginal colour Doppler ultrasound in assisted reproductive technology procedures. Hum Reprod 11:1589-91. Toth P. (2001) Clinical data supporting the importance of vascular LH/hCG receptors of uterine blood vessels. Semin Reprod Med 19:55-61. Vlaisavljevic V, Reljic M, Gavric-Lovrec V, Kovacic B. (2001) Subendometrial contractility is not predictive for in vitro fertilization (IVF) outcome. Ultrasound Obstet Gynecol 17:239-44.
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